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gint/fx9860g.ld

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Hybrid build system and runtime (no interrupts). t6k11 driver. Basic r61524 driver.
2018-04-19 13:24:26 +02:00
/*
Linker script for the fx9860g platform. Most of the symbols defined
here are used in the initialization routine in core/start.c; others are
used in core/setup.c.
*/
/* fx9860g may mean SH3 or SH4 and we want full compatibility */
OUTPUT_ARCH(sh3)
/* ELF offers a lot of symbol/section/relocation insights */
OUTPUT_FORMAT(elf32-sh)
/* Located in core/start.c */
ENTRY(_start)
MEMORY
{
core: backport TLB handling to fx9860g, fix return-to-menu (UNSTABLE) This change ports the TLB management system to fx9860g through %003. This raises the size limit for add-ins to about 500k. Because SH3 fx9860g does not have ILRAM, the GMAPPED attribute has been made to generate content to a .gint.mapped section which is sent to the P1 RAM section historically dubbed "real ram" in which gint's data and VBR are installed. (Now that I think about it, gint's data should try to go to normal RAM instead to reduce pressure on this invasion.) Return-to-menu was also fixed on both platforms by narrowing down the need for code to remain mapped to the chance of running it with interrupts disabled. The natural distribution of GMAPPED under this criterion showed that _gint_setvbr had been left under TLB control; moving it to the proper RAM area fixed gint switches. Finally, an omission in the bound checks for mappable TEA addresses (TEA >= 0x00300000) prevented the appearance of a non-interactible System ERROR popup when some unmapped addresses are accessed. This version still does not enable interrupts in timer callbacks, exposing any application to a crash if a timer underflows while its callback is not mapped. It is not suitable for any stable application!
2020-06-15 20:55:18 +02:00
/* Userspace mapping of the add-in (G1A header takes 0x200 bytes) */
rom (rx): o = 0x00300200, l = 500k
kernel: dynamic loading of GMAPPED functions to user RAM This commit introduces a large architectural change. Unlike previous models of the fx-9860G series, the G-III models have a new user RAM address different from 8801c000. The purpose of this change is to dynamically load GMAPPED functions to this address by querying the TLB, and call them through a function pointer whose address is determined when loading. Because of the overhead of using a function pointer in both assembly and C code, changes have been made to avoid GMAPPED functions altogether. Current, only cpu_setVBR() and gint_inth_callback() are left, the second being used specifically to enable TLB misses when needed. * Add a .gint.mappedrel section for the function pointers holding addresses to GMAPPED functions; add function pointers for cpu_setVBR() and gint_inth_callback() * Move rram to address 0 instead of the hardcoded 0x8801c000 * Load GMAPPED functions at their linked address + the physical address user RAM is mapped, to and compute their function pointers * Remove the GMAPPED macro since no user function needs it anymore * Add section flags "ax" (code) or "aw" (data) to every custom .section in assembler code, as they default to unpredictable values that can cause the section to be marked NOLOAD by the linker * Update the main kernel, TMU, ETMU and RTC interrupt handlers to use the new indirect calling method This is made possible by new MMU functions giving direct access to the physical area behind any virtualized page. * Add an mmu_translate() function to query the TLB * Add an mmu_uram() function to access user RAM from P1 The exception catching mechanism has been modified to avoid the use of GMAPPED functions altogether. * Set SR.BL=0 and SR.IMASK=15 before calling exception catchers * Move gint_exc_skip() to normal text ROM * Also fix registers not being popped off the stack before a panic The timer drivers have also been modified to avoid GMAPPED functions. * Invoke timer_stop() through gint_inth_callback() and move it to ROM * Move and expand the ETMU driver to span 3 blocks at 0xd00 (ETMU4) * Remove the timer_clear() function by inlining it into the ETMU handler (TCR is provided within the storage block of each timer) * Also split src/timer/inth.s into src/timer/inth-{tmu,etmu}.s Additionally, VBR addresses are now determined at runtime to further reduce hardcoded memory layout addresses in the linker script. * Determine fx-9860G VBR addresses dynamically from mmu_uram() * Determine fx-CG 50 VBR addresses dynamically from mmu_uram() * Remove linker symbols for VBR addresses Comments and documentation have been updated throughout the code to reflect the changes.
2020-09-17 14:48:54 +02:00
kernel: move VBR at the end of the user RAM area on fx-9860G This leaves more space available for the heap.
2021-02-15 09:39:14 +01:00
/* User RAM is mapped at 0x08100000 through MMU; usually 8k on SH3, 32k
on SH4. This script exposes only 6k to the user, reserving:
kernel: dynamic loading of GMAPPED functions to user RAM This commit introduces a large architectural change. Unlike previous models of the fx-9860G series, the G-III models have a new user RAM address different from 8801c000. The purpose of this change is to dynamically load GMAPPED functions to this address by querying the TLB, and call them through a function pointer whose address is determined when loading. Because of the overhead of using a function pointer in both assembly and C code, changes have been made to avoid GMAPPED functions altogether. Current, only cpu_setVBR() and gint_inth_callback() are left, the second being used specifically to enable TLB misses when needed. * Add a .gint.mappedrel section for the function pointers holding addresses to GMAPPED functions; add function pointers for cpu_setVBR() and gint_inth_callback() * Move rram to address 0 instead of the hardcoded 0x8801c000 * Load GMAPPED functions at their linked address + the physical address user RAM is mapped, to and compute their function pointers * Remove the GMAPPED macro since no user function needs it anymore * Add section flags "ax" (code) or "aw" (data) to every custom .section in assembler code, as they default to unpredictable values that can cause the section to be marked NOLOAD by the linker * Update the main kernel, TMU, ETMU and RTC interrupt handlers to use the new indirect calling method This is made possible by new MMU functions giving direct access to the physical area behind any virtualized page. * Add an mmu_translate() function to query the TLB * Add an mmu_uram() function to access user RAM from P1 The exception catching mechanism has been modified to avoid the use of GMAPPED functions altogether. * Set SR.BL=0 and SR.IMASK=15 before calling exception catchers * Move gint_exc_skip() to normal text ROM * Also fix registers not being popped off the stack before a panic The timer drivers have also been modified to avoid GMAPPED functions. * Invoke timer_stop() through gint_inth_callback() and move it to ROM * Move and expand the ETMU driver to span 3 blocks at 0xd00 (ETMU4) * Remove the timer_clear() function by inlining it into the ETMU handler (TCR is provided within the storage block of each timer) * Also split src/timer/inth.s into src/timer/inth-{tmu,etmu}.s Additionally, VBR addresses are now determined at runtime to further reduce hardcoded memory layout addresses in the linker script. * Determine fx-9860G VBR addresses dynamically from mmu_uram() * Determine fx-CG 50 VBR addresses dynamically from mmu_uram() * Remove linker symbols for VBR addresses Comments and documentation have been updated throughout the code to reflect the changes.
2020-09-17 14:48:54 +02:00
* 0x200 bytes for text accessed without the TLB when SR.BL=1, linked
into the rram region below, then loaded dynamically
kernel: move VBR at the end of the user RAM area on fx-9860G This leaves more space available for the heap.
2021-02-15 09:39:14 +01:00
* 0x600 bytes for the VBR space, also without MMU
On SH3, the VBR space consumes these 0x600 bytes. On SH4, it spans
0x1100 bytes near the end of the user RAM, which is larger; the 6k
left for the user are honored in both cases. Unused memory from the
exposed 6k and non-exposed memory is available through malloc(). */
kernel: move VBR to user RAM on fx9860g This change puts an end to the illegal occupation of some random RAM area, solving most of the return-to-menu issues, including (but not limited to) random key presses, multiple return, and VBR being overwritten. There are still known return-to-menu issues on SH3 (mainly just GetKeyWait() returning immediately to gint probably due to multiple KEY_CTRL_MENU being injected), but nothing crashy.
2020-07-10 15:51:54 +02:00
ram (rw): o = 0x08100200, l = 6k
kernel: dynamic loading of GMAPPED functions to user RAM This commit introduces a large architectural change. Unlike previous models of the fx-9860G series, the G-III models have a new user RAM address different from 8801c000. The purpose of this change is to dynamically load GMAPPED functions to this address by querying the TLB, and call them through a function pointer whose address is determined when loading. Because of the overhead of using a function pointer in both assembly and C code, changes have been made to avoid GMAPPED functions altogether. Current, only cpu_setVBR() and gint_inth_callback() are left, the second being used specifically to enable TLB misses when needed. * Add a .gint.mappedrel section for the function pointers holding addresses to GMAPPED functions; add function pointers for cpu_setVBR() and gint_inth_callback() * Move rram to address 0 instead of the hardcoded 0x8801c000 * Load GMAPPED functions at their linked address + the physical address user RAM is mapped, to and compute their function pointers * Remove the GMAPPED macro since no user function needs it anymore * Add section flags "ax" (code) or "aw" (data) to every custom .section in assembler code, as they default to unpredictable values that can cause the section to be marked NOLOAD by the linker * Update the main kernel, TMU, ETMU and RTC interrupt handlers to use the new indirect calling method This is made possible by new MMU functions giving direct access to the physical area behind any virtualized page. * Add an mmu_translate() function to query the TLB * Add an mmu_uram() function to access user RAM from P1 The exception catching mechanism has been modified to avoid the use of GMAPPED functions altogether. * Set SR.BL=0 and SR.IMASK=15 before calling exception catchers * Move gint_exc_skip() to normal text ROM * Also fix registers not being popped off the stack before a panic The timer drivers have also been modified to avoid GMAPPED functions. * Invoke timer_stop() through gint_inth_callback() and move it to ROM * Move and expand the ETMU driver to span 3 blocks at 0xd00 (ETMU4) * Remove the timer_clear() function by inlining it into the ETMU handler (TCR is provided within the storage block of each timer) * Also split src/timer/inth.s into src/timer/inth-{tmu,etmu}.s Additionally, VBR addresses are now determined at runtime to further reduce hardcoded memory layout addresses in the linker script. * Determine fx-9860G VBR addresses dynamically from mmu_uram() * Determine fx-CG 50 VBR addresses dynamically from mmu_uram() * Remove linker symbols for VBR addresses Comments and documentation have been updated throughout the code to reflect the changes.
2020-09-17 14:48:54 +02:00
/* This region represents the first block of user RAM. Linker arranges
sections as if linked to address 0, then gint's runtime determines
the location and relocates references (which are manual) */
rram (rwx): o = 0x00000000, l = 512
support data loading in ILRAM, XRAM and YRAM This change adds support for three sections .ilram, .xram and .yram, along with three macros GILRAM, GXRAM and GYRAM, that can be used to statically load data to on-chip memory.
2019-09-15 19:29:47 +02:00
/* On-chip IL memory */
ilram (rwx): o = 0xe5200000, l = 4k
/* On-chip X and Y memory */
ld: merge XRAM and YRAM into a single 16-kiB section
2022-05-04 18:21:23 +02:00
xyram (rwx): o = 0xe500e000, l = 16k
Hybrid build system and runtime (no interrupts). t6k11 driver. Basic r61524 driver.
2018-04-19 13:24:26 +02:00
}
SECTIONS
{
/*
support data loading in ILRAM, XRAM and YRAM This change adds support for three sections .ilram, .xram and .yram, along with three macros GILRAM, GXRAM and GYRAM, that can be used to statically load data to on-chip memory.
2019-09-15 19:29:47 +02:00
** ROM sections
Hybrid build system and runtime (no interrupts). t6k11 driver. Basic r61524 driver.
2018-04-19 13:24:26 +02:00
*/
/* First address to be mapped to ROM (including G1A header) */
_brom = 0x00300000;
/* Size of ROM mappings */
_srom = 0x200
+ SIZEOF(.text) + SIZEOF(.rodata)
+ SIZEOF(.gint.drivers) + SIZEOF(.gint.blocks);
/* Machine code going to ROM:
general cleanup of the kernel * Removed .pretext sections since the TLB is now entirely dynamic; left only .text.entry for the start symbol. * Reworked the main files of src/core to move the INTC to its own driver and let the kernel handle only VBR space and CPU (now: VBR & CPUOPM). * Moved src/core/gint.c to src/core/kernel.c and centralized all driver loops that save or restore context for more robustness. This leaves the callbacks of cpu_setVBR() (formerly gint_setvbr()) pretty short. * Coalesced gint_switch_out() and gint_switch_in() into a single function callback for cpu_setVBR(). * Added an abstraction of interrupt signals as an enumerated value so that drivers no longer hardcode the IPR and IMR numbers and bits, sometimes even with isSH3() due to differences in the SH7705. * Changed the interrupt blocking method in cpu_setVBR() from SR.BL=1 to SR.IMASK=15 so that TLB misses are still handled. This removes the need for callback functions to be GMAPPED. * Moved gint_osmenu() and its utilities to a new file src/core/osmenu.c.
2020-06-20 17:18:51 +02:00
- Entry function (.text.entry)
Hybrid build system and runtime (no interrupts). t6k11 driver. Basic r61524 driver.
2018-04-19 13:24:26 +02:00
- Compiler-provided constructors (.ctors) and destructors (.dtors)
- All text from .text and .text.* (including user code)
- Code sections from fxlib, named "C" and "P" */
general cleanup of the kernel * Removed .pretext sections since the TLB is now entirely dynamic; left only .text.entry for the start symbol. * Reworked the main files of src/core to move the INTC to its own driver and let the kernel handle only VBR space and CPU (now: VBR & CPUOPM). * Moved src/core/gint.c to src/core/kernel.c and centralized all driver loops that save or restore context for more robustness. This leaves the callbacks of cpu_setVBR() (formerly gint_setvbr()) pretty short. * Coalesced gint_switch_out() and gint_switch_in() into a single function callback for cpu_setVBR(). * Added an abstraction of interrupt signals as an enumerated value so that drivers no longer hardcode the IPR and IMR numbers and bits, sometimes even with isSH3() due to differences in the SH7705. * Changed the interrupt blocking method in cpu_setVBR() from SR.BL=1 to SR.IMASK=15 so that TLB misses are still handled. This removes the need for callback functions to be GMAPPED. * Moved gint_osmenu() and its utilities to a new file src/core/osmenu.c.
2020-06-20 17:18:51 +02:00
.text : {
*(.text.entry)
Hybrid build system and runtime (no interrupts). t6k11 driver. Basic r61524 driver.
2018-04-19 13:24:26 +02:00
general cleanup of the kernel * Removed .pretext sections since the TLB is now entirely dynamic; left only .text.entry for the start symbol. * Reworked the main files of src/core to move the INTC to its own driver and let the kernel handle only VBR space and CPU (now: VBR & CPUOPM). * Moved src/core/gint.c to src/core/kernel.c and centralized all driver loops that save or restore context for more robustness. This leaves the callbacks of cpu_setVBR() (formerly gint_setvbr()) pretty short. * Coalesced gint_switch_out() and gint_switch_in() into a single function callback for cpu_setVBR(). * Added an abstraction of interrupt signals as an enumerated value so that drivers no longer hardcode the IPR and IMR numbers and bits, sometimes even with isSH3() due to differences in the SH7705. * Changed the interrupt blocking method in cpu_setVBR() from SR.BL=1 to SR.IMASK=15 so that TLB misses are still handled. This removes the need for callback functions to be GMAPPED. * Moved gint_osmenu() and its utilities to a new file src/core/osmenu.c.
2020-06-20 17:18:51 +02:00
_bctors = . ;
Hybrid build system and runtime (no interrupts). t6k11 driver. Basic r61524 driver.
2018-04-19 13:24:26 +02:00
*(.ctors .ctors.*)
general cleanup of the kernel * Removed .pretext sections since the TLB is now entirely dynamic; left only .text.entry for the start symbol. * Reworked the main files of src/core to move the INTC to its own driver and let the kernel handle only VBR space and CPU (now: VBR & CPUOPM). * Moved src/core/gint.c to src/core/kernel.c and centralized all driver loops that save or restore context for more robustness. This leaves the callbacks of cpu_setVBR() (formerly gint_setvbr()) pretty short. * Coalesced gint_switch_out() and gint_switch_in() into a single function callback for cpu_setVBR(). * Added an abstraction of interrupt signals as an enumerated value so that drivers no longer hardcode the IPR and IMR numbers and bits, sometimes even with isSH3() due to differences in the SH7705. * Changed the interrupt blocking method in cpu_setVBR() from SR.BL=1 to SR.IMASK=15 so that TLB misses are still handled. This removes the need for callback functions to be GMAPPED. * Moved gint_osmenu() and its utilities to a new file src/core/osmenu.c.
2020-06-20 17:18:51 +02:00
_ectors = . ;
_bdtors = . ;
Hybrid build system and runtime (no interrupts). t6k11 driver. Basic r61524 driver.
2018-04-19 13:24:26 +02:00
*(.dtors .dtors.*)
general cleanup of the kernel * Removed .pretext sections since the TLB is now entirely dynamic; left only .text.entry for the start symbol. * Reworked the main files of src/core to move the INTC to its own driver and let the kernel handle only VBR space and CPU (now: VBR & CPUOPM). * Moved src/core/gint.c to src/core/kernel.c and centralized all driver loops that save or restore context for more robustness. This leaves the callbacks of cpu_setVBR() (formerly gint_setvbr()) pretty short. * Coalesced gint_switch_out() and gint_switch_in() into a single function callback for cpu_setVBR(). * Added an abstraction of interrupt signals as an enumerated value so that drivers no longer hardcode the IPR and IMR numbers and bits, sometimes even with isSH3() due to differences in the SH7705. * Changed the interrupt blocking method in cpu_setVBR() from SR.BL=1 to SR.IMASK=15 so that TLB misses are still handled. This removes the need for callback functions to be GMAPPED. * Moved gint_osmenu() and its utilities to a new file src/core/osmenu.c.
2020-06-20 17:18:51 +02:00
_edtors = . ;
Hybrid build system and runtime (no interrupts). t6k11 driver. Basic r61524 driver.
2018-04-19 13:24:26 +02:00
core: backport TLB handling to fx9860g, fix return-to-menu (UNSTABLE) This change ports the TLB management system to fx9860g through %003. This raises the size limit for add-ins to about 500k. Because SH3 fx9860g does not have ILRAM, the GMAPPED attribute has been made to generate content to a .gint.mapped section which is sent to the P1 RAM section historically dubbed "real ram" in which gint's data and VBR are installed. (Now that I think about it, gint's data should try to go to normal RAM instead to reduce pressure on this invasion.) Return-to-menu was also fixed on both platforms by narrowing down the need for code to remain mapped to the chance of running it with interrupts disabled. The natural distribution of GMAPPED under this criterion showed that _gint_setvbr had been left under TLB control; moving it to the proper RAM area fixed gint switches. Finally, an omission in the bound checks for mappable TEA addresses (TEA >= 0x00300000) prevented the appearance of a non-interactible System ERROR popup when some unmapped addresses are accessed. This version still does not enable interrupts in timer callbacks, exposing any application to a crash if a timer underflows while its callback is not mapped. It is not suitable for any stable application!
2020-06-15 20:55:18 +02:00
_gint_exch_start = . ;
*(.gint.exch)
_gint_exch_size = ABSOLUTE(. - _gint_exch_start);
_gint_tlbh_start = . ;
*(.gint.tlbh)
_gint_tlbh_size = ABSOLUTE(. - _gint_tlbh_start);
exc: add exception handlers, use them in the DMA This change introduces exception handlers that default to a fatal error with an on-screen description of the exception and some debugging information. It also adds the dprint() function as a definitely-needed helper and removes bootlog_unmapped() by using the exception handler for the fatal error display. (Also printf() is now required in all gint add-ins; this is sad, but space is not as much of a constraint as debugging.) Finally, the exception handler is used to handle an interrupt which is an exception in practice, the DMA address error. On fx-CG 50, additional DMA-related information is displayed on the screen. This is left out on fx-9860G as there is not enough space.
2019-09-03 22:15:00 +02:00
Hybrid build system and runtime (no interrupts). t6k11 driver. Basic r61524 driver.
2018-04-19 13:24:26 +02:00
*(.text .text.*)
*(C P)
} > rom
/* Interrupt handlers going to ROM:
- gint's interrupt handler blocks (.gint.blocks)
Although gint's blocks end up in VBR space, they are selected and
installed on-the-fly by the library and the drivers, so we can't
just put them in the vbr region and wait for the copy */
.gint.blocks : {
KEEP(*(.gint.blocks));
} > rom
/* Driver data going to ROM:
- Exposed driver interfaces (.gint.drivers)
The driver information is required to start and configure the
driver, even if the symbols are not referenced */
.gint.drivers : {
kernel: driver and world system overhaul Changes in the driver and world system: * Rewrite driver logic to include more advanced concepts. The notion of binding a driver to a device is introduced to formalize wait(); power management is now built-in instead of being handled by the drivers (for instance DMA). The new driver model is described in great detail in <gint/drivers.h> * Formalized the concept of "world switch" where the hardware state is saved and later restored. As a tool, the world switch turns out to be very stable, and allows a lot of hardware manipulation that would be edgy at best when running in the OS world. * Added a GINT_DRV_SHARED flag for drivers to specify that their state is shared between worlds and not saved/restored. This has a couple of uses. * Exposed a lot more of the internal driver/world system as their is no particular downside to it. This includes stuff in <gint/drivers.h> and the driver's state structures in <gint/drivers/states.h>. This is useful for debugging and for cracked concepts, but there is no API stability guarantee. * Added a more flexible driver level system that allows any 2-digit level to be used. Feature changes: * Added a CPU driver that provides the VBR change as its state save. Because the whole context switch relied on interrupts being disabled anyway, there is no longer an inversion of control when setting the VBR; this is just part of the CPU driver's configuration. The CPU driver may also support other features such as XYRAM block transfer in the future. * Moved gint_inthandler() to the INTC driver under the name intc_handler(), pairing up again with intc_priority(). * Added a reentrant atomic lock based on the test-and-set primitive. Interrupts are disabled with IMASK=15 for the duration of atomic operations. * Enabled the DMA driver on SH7305-based fx-9860G. The DMA provides little benefit on this platform because the RAM is generally faster and buffers are ultimately small. The DMA is still not available on SH3-based fx-9860G models. * Solved an extremely obnoxious bug in timer_spin_wait() where the timer is not freed, causing the callback to be called when interrupts are re-enabled. This increments a random value on the stack. As a consequence of the change, removed the long delays in the USB driver since they are not actually needed. Minor changes: * Deprecated some of the elements in <gint/hardware.h>. There really is no good way to "enumerate" devices yet. * Deprecated gint_switch() in favor of a new function gint_world_switch() which uses the GINT_CALL abstraction. * Made the fx-9860G VRAM 32-aligned so that it can be used for tests with the DMA. Some features of the driver and world systems have not been implemented yet, but may be in the future: * Some driver flags should be per-world in order to create multiple gint worlds. This would be useful in Yatis' hypervisor. * A GINT_DRV_LAZY flag would be useful for drivers that don't want to be started up automatically during a world switch. This is relevant for drivers that have a slow start/stop sequence. However, this is tricky to do correctly as it requires dynamic start/stop and also tracking which world the current hardware state belongs to.
2021-04-23 18:50:20 +02:00
_gint_drivers = . ;
KEEP(*(SORT_BY_NAME(.gint.drivers.*)));
_gint_drivers_end = . ;
Hybrid build system and runtime (no interrupts). t6k11 driver. Basic r61524 driver.
2018-04-19 13:24:26 +02:00
} > rom
/* Read-only data going to ROM:
- Resources or assets from fxconv or similar converters
- Data marked read-only by the compiler (.rodata and .rodata.*) */
.rodata : SUBALIGN(4) {
support data loading in ILRAM, XRAM and YRAM This change adds support for three sections .ilram, .xram and .yram, along with three macros GILRAM, GXRAM and GYRAM, that can be used to statically load data to on-chip memory.
2019-09-15 19:29:47 +02:00
/* Put these first, they need to be 4-aligned */
*(.rodata.4)
Hybrid build system and runtime (no interrupts). t6k11 driver. Basic r61524 driver.
2018-04-19 13:24:26 +02:00
*(.rodata .rodata.*)
} > rom
/*
support data loading in ILRAM, XRAM and YRAM This change adds support for three sections .ilram, .xram and .yram, along with three macros GILRAM, GXRAM and GYRAM, that can be used to statically load data to on-chip memory.
2019-09-15 19:29:47 +02:00
** RAM sections
Hybrid build system and runtime (no interrupts). t6k11 driver. Basic r61524 driver.
2018-04-19 13:24:26 +02:00
*/
. = ORIGIN(ram);
/* BSS stuff going to RAM:
- Data marked BSS by the compiler
- BSS sections from fxlib, namely "B" and "R"
The BSS section is to be stripped from the ELF file later, and wiped
at startup. */
.bss (NOLOAD) : {
_rbss = . ;
ld: properly link .bss.* sections
2022-08-21 20:11:45 +02:00
*(.bss .bss.* COMMON)
Hybrid build system and runtime (no interrupts). t6k11 driver. Basic r61524 driver.
2018-04-19 13:24:26 +02:00
*(B R)
. = ALIGN(16);
} > ram :NONE
_sbss = SIZEOF(.bss);
/* Read-write data going to RAM:
- Data sections generated by the compiler (.data and .data.*)
kernel: move VBR to user RAM on fx9860g This change puts an end to the illegal occupation of some random RAM area, solving most of the return-to-menu issues, including (but not limited to) random key presses, multiple return, and VBR being overwritten. There are still known return-to-menu issues on SH3 (mainly just GetKeyWait() returning immediately to gint probably due to multiple KEY_CTRL_MENU being injected), but nothing crashy.
2020-07-10 15:51:54 +02:00
- Data sections from fxlib, "D"
remove the .gint.data section Since both platforms now have their VBR and gint-specific data loaded along the add-in's data, the .gint.data section is entirely unused. The .gint.bss section is still used for uninitialized objects (it has different semantics than .bss which is initially cleared) and the .gint.data.sh3 and .gint.bss.sh3 sections that are dropped on the SH4-only fx-CG 50 are also still used.
2020-07-10 16:36:05 +02:00
- The SH3-only data section (.gint.data.sh3) */
Hybrid build system and runtime (no interrupts). t6k11 driver. Basic r61524 driver.
2018-04-19 13:24:26 +02:00
.data ALIGN(4) : ALIGN(4) {
_ldata = LOADADDR(.data);
_rdata = . ;
kernel: dynamic loading of GMAPPED functions to user RAM This commit introduces a large architectural change. Unlike previous models of the fx-9860G series, the G-III models have a new user RAM address different from 8801c000. The purpose of this change is to dynamically load GMAPPED functions to this address by querying the TLB, and call them through a function pointer whose address is determined when loading. Because of the overhead of using a function pointer in both assembly and C code, changes have been made to avoid GMAPPED functions altogether. Current, only cpu_setVBR() and gint_inth_callback() are left, the second being used specifically to enable TLB misses when needed. * Add a .gint.mappedrel section for the function pointers holding addresses to GMAPPED functions; add function pointers for cpu_setVBR() and gint_inth_callback() * Move rram to address 0 instead of the hardcoded 0x8801c000 * Load GMAPPED functions at their linked address + the physical address user RAM is mapped, to and compute their function pointers * Remove the GMAPPED macro since no user function needs it anymore * Add section flags "ax" (code) or "aw" (data) to every custom .section in assembler code, as they default to unpredictable values that can cause the section to be marked NOLOAD by the linker * Update the main kernel, TMU, ETMU and RTC interrupt handlers to use the new indirect calling method This is made possible by new MMU functions giving direct access to the physical area behind any virtualized page. * Add an mmu_translate() function to query the TLB * Add an mmu_uram() function to access user RAM from P1 The exception catching mechanism has been modified to avoid the use of GMAPPED functions altogether. * Set SR.BL=0 and SR.IMASK=15 before calling exception catchers * Move gint_exc_skip() to normal text ROM * Also fix registers not being popped off the stack before a panic The timer drivers have also been modified to avoid GMAPPED functions. * Invoke timer_stop() through gint_inth_callback() and move it to ROM * Move and expand the ETMU driver to span 3 blocks at 0xd00 (ETMU4) * Remove the timer_clear() function by inlining it into the ETMU handler (TCR is provided within the storage block of each timer) * Also split src/timer/inth.s into src/timer/inth-{tmu,etmu}.s Additionally, VBR addresses are now determined at runtime to further reduce hardcoded memory layout addresses in the linker script. * Determine fx-9860G VBR addresses dynamically from mmu_uram() * Determine fx-CG 50 VBR addresses dynamically from mmu_uram() * Remove linker symbols for VBR addresses Comments and documentation have been updated throughout the code to reflect the changes.
2020-09-17 14:48:54 +02:00
_lreloc = . ;
*(.gint.mappedrel);
_sreloc = ABSOLUTE(. - _lreloc);
Hybrid build system and runtime (no interrupts). t6k11 driver. Basic r61524 driver.
2018-04-19 13:24:26 +02:00
*(.data .data.*)
*(D)
remove the .gint.data section Since both platforms now have their VBR and gint-specific data loaded along the add-in's data, the .gint.data section is entirely unused. The .gint.bss section is still used for uninitialized objects (it has different semantics than .bss which is initially cleared) and the .gint.data.sh3 and .gint.bss.sh3 sections that are dropped on the SH4-only fx-CG 50 are also still used.
2020-07-10 16:36:05 +02:00
*(.gint.data.sh3)
Hybrid build system and runtime (no interrupts). t6k11 driver. Basic r61524 driver.
2018-04-19 13:24:26 +02:00
. = ALIGN(16);
} > ram AT> rom
way too much, including bopti/topti, timers, and more.
2019-02-21 20:58:38 +01:00
/* Read-write data sub-aligned to 4 bytes (mainly from fxconv) */
.data.4 : SUBALIGN(4) {
*(.data.4)
. = ALIGN(16);
} > ram AT> rom
_sdata = SIZEOF(.data) + SIZEOF(.data.4);
Hybrid build system and runtime (no interrupts). t6k11 driver. Basic r61524 driver.
2018-04-19 13:24:26 +02:00
kernel: move VBR to user RAM on fx9860g This change puts an end to the illegal occupation of some random RAM area, solving most of the return-to-menu issues, including (but not limited to) random key presses, multiple return, and VBR being overwritten. There are still known return-to-menu issues on SH3 (mainly just GetKeyWait() returning immediately to gint probably due to multiple KEY_CTRL_MENU being injected), but nothing crashy.
2020-07-10 15:51:54 +02:00
/* gint's uninitialized BSS section */
.gint.bss (NOLOAD) : {
/* Since it's uninitialized, the location doesn't matter */
remove the .gint.data section Since both platforms now have their VBR and gint-specific data loaded along the add-in's data, the .gint.data section is entirely unused. The .gint.bss section is still used for uninitialized objects (it has different semantics than .bss which is initially cleared) and the .gint.data.sh3 and .gint.bss.sh3 sections that are dropped on the SH4-only fx-CG 50 are also still used.
2020-07-10 16:36:05 +02:00
*(.gint.bss .gint.bss.sh3)
kernel: move VBR to user RAM on fx9860g This change puts an end to the illegal occupation of some random RAM area, solving most of the return-to-menu issues, including (but not limited to) random key presses, multiple return, and VBR being overwritten. There are still known return-to-menu issues on SH3 (mainly just GetKeyWait() returning immediately to gint probably due to multiple KEY_CTRL_MENU being injected), but nothing crashy.
2020-07-10 15:51:54 +02:00
. = ALIGN(16);
kernel: move VBR at the end of the user RAM area on fx-9860G This leaves more space available for the heap.
2021-02-15 09:39:14 +01:00
/* End of user RAM */
_euram = . ;
kernel: move VBR to user RAM on fx9860g This change puts an end to the illegal occupation of some random RAM area, solving most of the return-to-menu issues, including (but not limited to) random key presses, multiple return, and VBR being overwritten. There are still known return-to-menu issues on SH3 (mainly just GetKeyWait() returning immediately to gint probably due to multiple KEY_CTRL_MENU being injected), but nothing crashy.
2020-07-10 15:51:54 +02:00
} > ram :NONE
_sgbss = SIZEOF(.gint.bss);
support data loading in ILRAM, XRAM and YRAM This change adds support for three sections .ilram, .xram and .yram, along with three macros GILRAM, GXRAM and GYRAM, that can be used to statically load data to on-chip memory.
2019-09-15 19:29:47 +02:00
/* On-chip memory sections: IL, X and Y memory */
. = ORIGIN(ilram);
.ilram ALIGN(4) : ALIGN(4) {
_lilram = LOADADDR(.ilram);
_rilram = . ;
*(.ilram)
. = ALIGN(16);
} > ilram AT> rom
ld: merge XRAM and YRAM into a single 16-kiB section
2022-05-04 18:21:23 +02:00
. = ORIGIN(xyram);
.xyram ALIGN(4) : ALIGN(4) {
_lxyram = LOADADDR(.xyram);
_rxyram = . ;
support data loading in ILRAM, XRAM and YRAM This change adds support for three sections .ilram, .xram and .yram, along with three macros GILRAM, GXRAM and GYRAM, that can be used to statically load data to on-chip memory.
2019-09-15 19:29:47 +02:00
ld: merge XRAM and YRAM into a single 16-kiB section
2022-05-04 18:21:23 +02:00
*(.xram .yram .xyram)
support data loading in ILRAM, XRAM and YRAM This change adds support for three sections .ilram, .xram and .yram, along with three macros GILRAM, GXRAM and GYRAM, that can be used to statically load data to on-chip memory.
2019-09-15 19:29:47 +02:00
. = ALIGN(16);
ld: merge XRAM and YRAM into a single 16-kiB section
2022-05-04 18:21:23 +02:00
} > xyram AT> rom
support data loading in ILRAM, XRAM and YRAM This change adds support for three sections .ilram, .xram and .yram, along with three macros GILRAM, GXRAM and GYRAM, that can be used to statically load data to on-chip memory.
2019-09-15 19:29:47 +02:00
_silram = SIZEOF(.ilram);
ld: merge XRAM and YRAM into a single 16-kiB section
2022-05-04 18:21:23 +02:00
_sxyram = SIZEOF(.xyram);
support data loading in ILRAM, XRAM and YRAM This change adds support for three sections .ilram, .xram and .yram, along with three macros GILRAM, GXRAM and GYRAM, that can be used to statically load data to on-chip memory.
2019-09-15 19:29:47 +02:00
Hybrid build system and runtime (no interrupts). t6k11 driver. Basic r61524 driver.
2018-04-19 13:24:26 +02:00
/*
kernel: dynamic loading of GMAPPED functions to user RAM This commit introduces a large architectural change. Unlike previous models of the fx-9860G series, the G-III models have a new user RAM address different from 8801c000. The purpose of this change is to dynamically load GMAPPED functions to this address by querying the TLB, and call them through a function pointer whose address is determined when loading. Because of the overhead of using a function pointer in both assembly and C code, changes have been made to avoid GMAPPED functions altogether. Current, only cpu_setVBR() and gint_inth_callback() are left, the second being used specifically to enable TLB misses when needed. * Add a .gint.mappedrel section for the function pointers holding addresses to GMAPPED functions; add function pointers for cpu_setVBR() and gint_inth_callback() * Move rram to address 0 instead of the hardcoded 0x8801c000 * Load GMAPPED functions at their linked address + the physical address user RAM is mapped, to and compute their function pointers * Remove the GMAPPED macro since no user function needs it anymore * Add section flags "ax" (code) or "aw" (data) to every custom .section in assembler code, as they default to unpredictable values that can cause the section to be marked NOLOAD by the linker * Update the main kernel, TMU, ETMU and RTC interrupt handlers to use the new indirect calling method This is made possible by new MMU functions giving direct access to the physical area behind any virtualized page. * Add an mmu_translate() function to query the TLB * Add an mmu_uram() function to access user RAM from P1 The exception catching mechanism has been modified to avoid the use of GMAPPED functions altogether. * Set SR.BL=0 and SR.IMASK=15 before calling exception catchers * Move gint_exc_skip() to normal text ROM * Also fix registers not being popped off the stack before a panic The timer drivers have also been modified to avoid GMAPPED functions. * Invoke timer_stop() through gint_inth_callback() and move it to ROM * Move and expand the ETMU driver to span 3 blocks at 0xd00 (ETMU4) * Remove the timer_clear() function by inlining it into the ETMU handler (TCR is provided within the storage block of each timer) * Also split src/timer/inth.s into src/timer/inth-{tmu,etmu}.s Additionally, VBR addresses are now determined at runtime to further reduce hardcoded memory layout addresses in the linker script. * Determine fx-9860G VBR addresses dynamically from mmu_uram() * Determine fx-CG 50 VBR addresses dynamically from mmu_uram() * Remove linker symbols for VBR addresses Comments and documentation have been updated throughout the code to reflect the changes.
2020-09-17 14:48:54 +02:00
** Relocated no-MMU RAM sections
Hybrid build system and runtime (no interrupts). t6k11 driver. Basic r61524 driver.
2018-04-19 13:24:26 +02:00
*/
. = ORIGIN(rram);
kernel: dynamic loading of GMAPPED functions to user RAM This commit introduces a large architectural change. Unlike previous models of the fx-9860G series, the G-III models have a new user RAM address different from 8801c000. The purpose of this change is to dynamically load GMAPPED functions to this address by querying the TLB, and call them through a function pointer whose address is determined when loading. Because of the overhead of using a function pointer in both assembly and C code, changes have been made to avoid GMAPPED functions altogether. Current, only cpu_setVBR() and gint_inth_callback() are left, the second being used specifically to enable TLB misses when needed. * Add a .gint.mappedrel section for the function pointers holding addresses to GMAPPED functions; add function pointers for cpu_setVBR() and gint_inth_callback() * Move rram to address 0 instead of the hardcoded 0x8801c000 * Load GMAPPED functions at their linked address + the physical address user RAM is mapped, to and compute their function pointers * Remove the GMAPPED macro since no user function needs it anymore * Add section flags "ax" (code) or "aw" (data) to every custom .section in assembler code, as they default to unpredictable values that can cause the section to be marked NOLOAD by the linker * Update the main kernel, TMU, ETMU and RTC interrupt handlers to use the new indirect calling method This is made possible by new MMU functions giving direct access to the physical area behind any virtualized page. * Add an mmu_translate() function to query the TLB * Add an mmu_uram() function to access user RAM from P1 The exception catching mechanism has been modified to avoid the use of GMAPPED functions altogether. * Set SR.BL=0 and SR.IMASK=15 before calling exception catchers * Move gint_exc_skip() to normal text ROM * Also fix registers not being popped off the stack before a panic The timer drivers have also been modified to avoid GMAPPED functions. * Invoke timer_stop() through gint_inth_callback() and move it to ROM * Move and expand the ETMU driver to span 3 blocks at 0xd00 (ETMU4) * Remove the timer_clear() function by inlining it into the ETMU handler (TCR is provided within the storage block of each timer) * Also split src/timer/inth.s into src/timer/inth-{tmu,etmu}.s Additionally, VBR addresses are now determined at runtime to further reduce hardcoded memory layout addresses in the linker script. * Determine fx-9860G VBR addresses dynamically from mmu_uram() * Determine fx-CG 50 VBR addresses dynamically from mmu_uram() * Remove linker symbols for VBR addresses Comments and documentation have been updated throughout the code to reflect the changes.
2020-09-17 14:48:54 +02:00
/* Code that must remain permanently mapped (.gint.mapped); relocated
to start of user RAM at startup, accessed through P1 */
remove the .gint.data section Since both platforms now have their VBR and gint-specific data loaded along the add-in's data, the .gint.data section is entirely unused. The .gint.bss section is still used for uninitialized objects (it has different semantics than .bss which is initially cleared) and the .gint.data.sh3 and .gint.bss.sh3 sections that are dropped on the SH4-only fx-CG 50 are also still used.
2020-07-10 16:36:05 +02:00
.gint.mapped ALIGN(4) : ALIGN(4) {
_lgmapped = LOADADDR(.gint.mapped);
core: backport TLB handling to fx9860g, fix return-to-menu (UNSTABLE) This change ports the TLB management system to fx9860g through %003. This raises the size limit for add-ins to about 500k. Because SH3 fx9860g does not have ILRAM, the GMAPPED attribute has been made to generate content to a .gint.mapped section which is sent to the P1 RAM section historically dubbed "real ram" in which gint's data and VBR are installed. (Now that I think about it, gint's data should try to go to normal RAM instead to reduce pressure on this invasion.) Return-to-menu was also fixed on both platforms by narrowing down the need for code to remain mapped to the chance of running it with interrupts disabled. The natural distribution of GMAPPED under this criterion showed that _gint_setvbr had been left under TLB control; moving it to the proper RAM area fixed gint switches. Finally, an omission in the bound checks for mappable TEA addresses (TEA >= 0x00300000) prevented the appearance of a non-interactible System ERROR popup when some unmapped addresses are accessed. This version still does not enable interrupts in timer callbacks, exposing any application to a crash if a timer underflows while its callback is not mapped. It is not suitable for any stable application!
2020-06-15 20:55:18 +02:00
*(.gint.mapped)
Hybrid build system and runtime (no interrupts). t6k11 driver. Basic r61524 driver.
2018-04-19 13:24:26 +02:00
. = ALIGN(16);
} > rram AT> rom
remove the .gint.data section Since both platforms now have their VBR and gint-specific data loaded along the add-in's data, the .gint.data section is entirely unused. The .gint.bss section is still used for uninitialized objects (it has different semantics than .bss which is initially cleared) and the .gint.data.sh3 and .gint.bss.sh3 sections that are dropped on the SH4-only fx-CG 50 are also still used.
2020-07-10 16:36:05 +02:00
_sgmapped = SIZEOF(.gint.mapped);
Hybrid build system and runtime (no interrupts). t6k11 driver. Basic r61524 driver.
2018-04-19 13:24:26 +02:00
/*
kernel: dynamic loading of GMAPPED functions to user RAM This commit introduces a large architectural change. Unlike previous models of the fx-9860G series, the G-III models have a new user RAM address different from 8801c000. The purpose of this change is to dynamically load GMAPPED functions to this address by querying the TLB, and call them through a function pointer whose address is determined when loading. Because of the overhead of using a function pointer in both assembly and C code, changes have been made to avoid GMAPPED functions altogether. Current, only cpu_setVBR() and gint_inth_callback() are left, the second being used specifically to enable TLB misses when needed. * Add a .gint.mappedrel section for the function pointers holding addresses to GMAPPED functions; add function pointers for cpu_setVBR() and gint_inth_callback() * Move rram to address 0 instead of the hardcoded 0x8801c000 * Load GMAPPED functions at their linked address + the physical address user RAM is mapped, to and compute their function pointers * Remove the GMAPPED macro since no user function needs it anymore * Add section flags "ax" (code) or "aw" (data) to every custom .section in assembler code, as they default to unpredictable values that can cause the section to be marked NOLOAD by the linker * Update the main kernel, TMU, ETMU and RTC interrupt handlers to use the new indirect calling method This is made possible by new MMU functions giving direct access to the physical area behind any virtualized page. * Add an mmu_translate() function to query the TLB * Add an mmu_uram() function to access user RAM from P1 The exception catching mechanism has been modified to avoid the use of GMAPPED functions altogether. * Set SR.BL=0 and SR.IMASK=15 before calling exception catchers * Move gint_exc_skip() to normal text ROM * Also fix registers not being popped off the stack before a panic The timer drivers have also been modified to avoid GMAPPED functions. * Invoke timer_stop() through gint_inth_callback() and move it to ROM * Move and expand the ETMU driver to span 3 blocks at 0xd00 (ETMU4) * Remove the timer_clear() function by inlining it into the ETMU handler (TCR is provided within the storage block of each timer) * Also split src/timer/inth.s into src/timer/inth-{tmu,etmu}.s Additionally, VBR addresses are now determined at runtime to further reduce hardcoded memory layout addresses in the linker script. * Determine fx-9860G VBR addresses dynamically from mmu_uram() * Determine fx-CG 50 VBR addresses dynamically from mmu_uram() * Remove linker symbols for VBR addresses Comments and documentation have been updated throughout the code to reflect the changes.
2020-09-17 14:48:54 +02:00
** Unused sections
Hybrid build system and runtime (no interrupts). t6k11 driver. Basic r61524 driver.
2018-04-19 13:24:26 +02:00
*/
/DISCARD/ : {
kernel: dynamic loading of GMAPPED functions to user RAM This commit introduces a large architectural change. Unlike previous models of the fx-9860G series, the G-III models have a new user RAM address different from 8801c000. The purpose of this change is to dynamically load GMAPPED functions to this address by querying the TLB, and call them through a function pointer whose address is determined when loading. Because of the overhead of using a function pointer in both assembly and C code, changes have been made to avoid GMAPPED functions altogether. Current, only cpu_setVBR() and gint_inth_callback() are left, the second being used specifically to enable TLB misses when needed. * Add a .gint.mappedrel section for the function pointers holding addresses to GMAPPED functions; add function pointers for cpu_setVBR() and gint_inth_callback() * Move rram to address 0 instead of the hardcoded 0x8801c000 * Load GMAPPED functions at their linked address + the physical address user RAM is mapped, to and compute their function pointers * Remove the GMAPPED macro since no user function needs it anymore * Add section flags "ax" (code) or "aw" (data) to every custom .section in assembler code, as they default to unpredictable values that can cause the section to be marked NOLOAD by the linker * Update the main kernel, TMU, ETMU and RTC interrupt handlers to use the new indirect calling method This is made possible by new MMU functions giving direct access to the physical area behind any virtualized page. * Add an mmu_translate() function to query the TLB * Add an mmu_uram() function to access user RAM from P1 The exception catching mechanism has been modified to avoid the use of GMAPPED functions altogether. * Set SR.BL=0 and SR.IMASK=15 before calling exception catchers * Move gint_exc_skip() to normal text ROM * Also fix registers not being popped off the stack before a panic The timer drivers have also been modified to avoid GMAPPED functions. * Invoke timer_stop() through gint_inth_callback() and move it to ROM * Move and expand the ETMU driver to span 3 blocks at 0xd00 (ETMU4) * Remove the timer_clear() function by inlining it into the ETMU handler (TCR is provided within the storage block of each timer) * Also split src/timer/inth.s into src/timer/inth-{tmu,etmu}.s Additionally, VBR addresses are now determined at runtime to further reduce hardcoded memory layout addresses in the linker script. * Determine fx-9860G VBR addresses dynamically from mmu_uram() * Determine fx-CG 50 VBR addresses dynamically from mmu_uram() * Remove linker symbols for VBR addresses Comments and documentation have been updated throughout the code to reflect the changes.
2020-09-17 14:48:54 +02:00
/* Java class registration (why are they even here?!) */
Hybrid build system and runtime (no interrupts). t6k11 driver. Basic r61524 driver.
2018-04-19 13:24:26 +02:00
*(.jcr)
kernel: dynamic loading of GMAPPED functions to user RAM This commit introduces a large architectural change. Unlike previous models of the fx-9860G series, the G-III models have a new user RAM address different from 8801c000. The purpose of this change is to dynamically load GMAPPED functions to this address by querying the TLB, and call them through a function pointer whose address is determined when loading. Because of the overhead of using a function pointer in both assembly and C code, changes have been made to avoid GMAPPED functions altogether. Current, only cpu_setVBR() and gint_inth_callback() are left, the second being used specifically to enable TLB misses when needed. * Add a .gint.mappedrel section for the function pointers holding addresses to GMAPPED functions; add function pointers for cpu_setVBR() and gint_inth_callback() * Move rram to address 0 instead of the hardcoded 0x8801c000 * Load GMAPPED functions at their linked address + the physical address user RAM is mapped, to and compute their function pointers * Remove the GMAPPED macro since no user function needs it anymore * Add section flags "ax" (code) or "aw" (data) to every custom .section in assembler code, as they default to unpredictable values that can cause the section to be marked NOLOAD by the linker * Update the main kernel, TMU, ETMU and RTC interrupt handlers to use the new indirect calling method This is made possible by new MMU functions giving direct access to the physical area behind any virtualized page. * Add an mmu_translate() function to query the TLB * Add an mmu_uram() function to access user RAM from P1 The exception catching mechanism has been modified to avoid the use of GMAPPED functions altogether. * Set SR.BL=0 and SR.IMASK=15 before calling exception catchers * Move gint_exc_skip() to normal text ROM * Also fix registers not being popped off the stack before a panic The timer drivers have also been modified to avoid GMAPPED functions. * Invoke timer_stop() through gint_inth_callback() and move it to ROM * Move and expand the ETMU driver to span 3 blocks at 0xd00 (ETMU4) * Remove the timer_clear() function by inlining it into the ETMU handler (TCR is provided within the storage block of each timer) * Also split src/timer/inth.s into src/timer/inth-{tmu,etmu}.s Additionally, VBR addresses are now determined at runtime to further reduce hardcoded memory layout addresses in the linker script. * Determine fx-9860G VBR addresses dynamically from mmu_uram() * Determine fx-CG 50 VBR addresses dynamically from mmu_uram() * Remove linker symbols for VBR addresses Comments and documentation have been updated throughout the code to reflect the changes.
2020-09-17 14:48:54 +02:00
/* Asynchronous unwind tables: no C++ exception handling */
Hybrid build system and runtime (no interrupts). t6k11 driver. Basic r61524 driver.
2018-04-19 13:24:26 +02:00
*(.eh_frame_hdr)
*(.eh_frame)
kernel: dynamic loading of GMAPPED functions to user RAM This commit introduces a large architectural change. Unlike previous models of the fx-9860G series, the G-III models have a new user RAM address different from 8801c000. The purpose of this change is to dynamically load GMAPPED functions to this address by querying the TLB, and call them through a function pointer whose address is determined when loading. Because of the overhead of using a function pointer in both assembly and C code, changes have been made to avoid GMAPPED functions altogether. Current, only cpu_setVBR() and gint_inth_callback() are left, the second being used specifically to enable TLB misses when needed. * Add a .gint.mappedrel section for the function pointers holding addresses to GMAPPED functions; add function pointers for cpu_setVBR() and gint_inth_callback() * Move rram to address 0 instead of the hardcoded 0x8801c000 * Load GMAPPED functions at their linked address + the physical address user RAM is mapped, to and compute their function pointers * Remove the GMAPPED macro since no user function needs it anymore * Add section flags "ax" (code) or "aw" (data) to every custom .section in assembler code, as they default to unpredictable values that can cause the section to be marked NOLOAD by the linker * Update the main kernel, TMU, ETMU and RTC interrupt handlers to use the new indirect calling method This is made possible by new MMU functions giving direct access to the physical area behind any virtualized page. * Add an mmu_translate() function to query the TLB * Add an mmu_uram() function to access user RAM from P1 The exception catching mechanism has been modified to avoid the use of GMAPPED functions altogether. * Set SR.BL=0 and SR.IMASK=15 before calling exception catchers * Move gint_exc_skip() to normal text ROM * Also fix registers not being popped off the stack before a panic The timer drivers have also been modified to avoid GMAPPED functions. * Invoke timer_stop() through gint_inth_callback() and move it to ROM * Move and expand the ETMU driver to span 3 blocks at 0xd00 (ETMU4) * Remove the timer_clear() function by inlining it into the ETMU handler (TCR is provided within the storage block of each timer) * Also split src/timer/inth.s into src/timer/inth-{tmu,etmu}.s Additionally, VBR addresses are now determined at runtime to further reduce hardcoded memory layout addresses in the linker script. * Determine fx-9860G VBR addresses dynamically from mmu_uram() * Determine fx-CG 50 VBR addresses dynamically from mmu_uram() * Remove linker symbols for VBR addresses Comments and documentation have been updated throughout the code to reflect the changes.
2020-09-17 14:48:54 +02:00
/* Comments or anything the compiler might generate */
Hybrid build system and runtime (no interrupts). t6k11 driver. Basic r61524 driver.
2018-04-19 13:24:26 +02:00
*(.comment)
}
}
Reference in a new issue Copy permalink