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kernel: preload add-in to TLB on SH3 (UNSTABLE) (#12)

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Lephe 2020-09-28 14:09:03 +02:00
parent e66b9083b4
commit 9b462deca1
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1 changed files with 20 additions and 0 deletions
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src/kernel/start.c
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@ -113,6 +113,26 @@ int start(int isappli, int optnum)
/* Detect hardware; this will mainly tell SH3 from SH4 on fx-9860G */ /* Detect hardware; this will mainly tell SH3 from SH4 on fx-9860G */
hw_detect(); hw_detect();
/* The dynamic TLB mechanism for old SH3-based fx-9860G (basically OS
1.00 and the fx-9860G emulator) is not clear yet, so gint can't load
pages dynamically. Load everything preventively (works only if the
add-in is small enough) */
#ifdef FX9860G
if(isSH3())
{
/* Try to map every ROM address up to _srom */
volatile uint8_t *x = (void *)0x00300000;
uint32_t loaded = 0;
while(loaded < (uint32_t)&srom)
{
volatile uint8_t y = *x;
loaded += 1024;
x += 1024;
}
}
#endif
/* Load data sections and wipe the bss section. This has to be done /* Load data sections and wipe the bss section. This has to be done
first for static and global variables to be initialized */ first for static and global variables to be initialized */
regcpy(&ldata, &sdata, &rdata); regcpy(&ldata, &sdata, &rdata);