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core: add BFile syscalls
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lephe
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2 changed files with 140 additions and 2 deletions
81
include/gint/bfile.h
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81
include/gint/bfile.h
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//---
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// gint:bfile - BFile interface
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//
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// The system's file system is a nightmare and the risk of corrupting it
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// or the flash by driving it manually is too great to risk. This module
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// interfaces with the BFile syscalls for file management.
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//---
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#ifndef GINT_BFILE
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#define GINT_BFILE
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#include <stdint.h>
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/* BFile_Remove(): Remove a file
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Also works if the file does not exist.
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@file FONTCHARACTER file path
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Returns a BFile error code. */
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int BFile_Remove(uint16_t const *file);
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/* BFile_Create(): Create a new entry
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The file or directory must not exist. For a file the size pointer must point
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to the desired file size (which is fixed), for a folder it is ignored.
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@file FONTCHARACTER file path
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@type Entry type
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@size Pointer to file size if [type = BFile_File], ignored otherwise
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Returns a BFile error code. */
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enum BFile_EntryType
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{
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BFile_File = 1,
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BFile_Folder = 5,
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};
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int BFile_Create(uint16_t const *file, enum BFile_EntryType type, int *size);
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/* BFile_Open(): Open an existing file
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The file must exist.
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@file FONTCHARACTER file path
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@mode Desired access mode
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Returns a file descriptor on success, or a negative BFile error code. */
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enum BFile_OpenMode
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{
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BFile_ReadOnly = 0x01,
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BFile_WriteOnly = 0x02,
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BFile_ReadWrite = BFile_ReadOnly | BFile_WriteOnly,
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};
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int BFile_Open(uint16_t const *file, enum BFile_OpenMode mode);
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/* BFile_Close(): Close a file descriptor
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@fd Open file descriptor
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Returns a BFile error code. */
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int BFile_Close(int fd);
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/* BFile_Write(): Write data to an open file
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Second and third argument specify the data and length to write.
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WARNING: The file systems has shown to become inconsistent if an odd number
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of bytes is written with BFile_Write(). Keep it even!
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@fd File descriptor open for writing
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@data Data to write
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@even_size Size to write (must be even, yes)
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Returns a BFile error code. */
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int BFile_Write(int fd, void const *data, int even_size);
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/* BFile_Read(): Read data from an open file
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The second and third argument specify where to store and how much to read.
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The location from where the data is read depends on [whence]:
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* If [whence >= 0], it is taken as an absolute location within the file;
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* If [whence == -1], BFile_Read() reads from the current position.
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@fd File descriptor open for reading
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@data Buffer of at least [size] bytes to store data to
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@size Number of bytes to read
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@whence Starting position of the data to read in the file
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Returns a BFile error code. */
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int BFile_Read(int handle, void *data, int size, int whence);
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#endif /* GINT_BFILE */
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@ -1,9 +1,9 @@
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/*
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** gint:core:syscalls - calls to CASIOWIN
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**
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** This files can be seen as a list of everywhere gint relies on the
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** This file can be seen as a list of everywhere gint relies on the
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** underlying OS. Although I wish to make gint free-standing, there are
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** still a few hard dependencies, namely:
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** still a few hard questions, namely:
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** * MMU management, because doing it wrong might break the calculator.
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** * Dynamic allocation, because we can't trash the system heap.
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** * File system, because it's a mess and we might ruin the ROM.
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@ -16,6 +16,13 @@
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.global ___realloc
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/* OS version, for debugging purposes */
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.global ___os_version
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/* Bfile calls */
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.global _BFile_Remove
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.global _BFile_Create
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.global _BFile_Open
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.global _BFile_Close
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.global _BFile_Write
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.global _BFile_Read
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.section ".pretext"
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@ -30,6 +37,56 @@ ___os_version:
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nop
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1: .long 0x02ee
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/* BFile driver */
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# int BFile_Remove(const uint16_t *file)
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_BFile_Remove:
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mov.l 1f, r0
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mov.l syscall_table, r1
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jmp @r1
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mov #0, r5
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1: .long 0x0439
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# int BFile_Create(uint16_t *file, enum { file = 1, folder = 5 }, int *size)
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_BFile_Create:
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mov.l 1f, r0
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mov.l syscall_table, r1
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jmp @r1
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nop
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1: .long 0x0434
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# int BFile_Open(const uint16_t *file, int mode)
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_BFile_Open:
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mov.l 1f, r0
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mov.l syscall_table, r1
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jmp @r1
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mov #0, r6
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1: .long 0x042c
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# int BFile_Close(int handle)
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_BFile_Close:
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mov.l 1f, r0
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mov.l syscall_table, r1
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jmp @r1
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nop
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1: .long 0x042d
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# int BFile_Write(int handle, const void *ram_buffer, int even_size)
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_BFile_Write:
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mov.l 1f, r0
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mov.l syscall_table, r1
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jmp @r1
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nop
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1: .long 0x0435
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# int BFile_Read(int handle, void *ram_buffer, int size, int whence)
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_BFile_Read:
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mov.l 1f, r0
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mov.l syscall_table, r1
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jmp @r1
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nop
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1: .long 0x0432
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syscall_table:
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.long 0x80010070
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