mirror of
https://github.com/Ed94/pikuma_ps1.git
synced 2026-08-09 00:58:16 +00:00
35 lines
1.4 KiB
C
35 lines
1.4 KiB
C
#ifdef INTELLISENSE_DIRECTIVES
|
|
# include "gen/macs.h"
|
|
# include "gen/offsets.h"
|
|
# include "bios.h"
|
|
# include "lottes_tape.h"
|
|
#endif
|
|
|
|
ATOM_FILE_DEBUGGER_LINE_MARKER(mips_atom_c);
|
|
|
|
#pragma region Baked Atoms
|
|
|
|
/* Flushes the Instruction Cache (PSX A-function 0x44 via BIOS stub at 0xA0).
|
|
* Sequence (per MIPS ABI; arguments in arg registers, RA pushed to stack):
|
|
* 1. sp -= 8; sw $ra, 4($sp) ; save RA
|
|
* 2. $a0 = bios_flushcache (arg0)
|
|
* 3. $t0 = bios_table_addr ; t0 = &BIOS A-function table
|
|
* 4. jalr $t0, $ra ; call BIOS(flushcache)
|
|
* nop ; branch delay slot
|
|
* 5. lw $ra, 4($sp); jr $ra ; restore & return
|
|
* 6. sp += 8
|
|
*/
|
|
internal MipsAtom_(mips_flush_icache) {
|
|
add_ui(rstack_ptr, rstack_ptr, -MipsStackAlignment), // sp -= 8
|
|
store_word(rret_addr, rstack_ptr, S_(U4)), // sw $ra, 4($sp)
|
|
add_ui(rret_0, rdiscard, bios_flushcache), // addiu $a0, $0, 0x44
|
|
add_ui(rtmp_0, rdiscard, bios_table_addr), // addiu $t0, $0, 0xA0
|
|
jump_link(rtmp_0, rret_addr), nop, // jalr $t0, $ra, BD slot
|
|
load_word(rret_addr, rstack_ptr, S_(U4)), // lw $ra, 4($sp)
|
|
jump_reg(rret_addr), // jr $ra
|
|
add_ui(rstack_ptr, rstack_ptr, MipsStackAlignment), // sp += 8 (BD)
|
|
mac_yield(),
|
|
};
|
|
|
|
#pragma endregion Baked Atoms
|