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35 lines
1.3 KiB
C
35 lines
1.3 KiB
C
#ifdef INTELLISENSE_DIRECTIVES
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# include "gen/macs.h"
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# include "gen/offsets.h"
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# include "bios.h"
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# include "lottes_tape.h"
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#endif
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ATOM_FILE_DEBUGGER_LINE_MARKER(mips_atom_c);
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#pragma region Baked Atoms
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/* Flushes the Instruction Cache (PSX A-function 0x44 via BIOS stub at 0xA0).
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* Sequence (per MIPS ABI; arguments in arg registers, RA pushed to stack):
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* 1. sp -= 8; sw $ra, 4($sp) ; save RA
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* 2. $a0 = bios_flushcache (arg0)
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* 3. $t0 = bios_table_addr ; t0 = &BIOS A-function table
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* 4. jalr $t0, $ra ; call BIOS(flushcache)
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* nop ; branch delay slot
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* 5. lw $ra, 4($sp); jr $ra ; restore & return
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* 6. sp += 8
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*/
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internal MipsAtom_(mips_flush_icache) {
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add_ui(R_SP, R_SP, -MipsStackAlignment), // sp -= 8
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store_word(R_RA, R_SP, S_(U4)), // sw $ra, 4($sp)
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add_ui(R_V0, R_0, bios_flushcache), // addiu $a0, $0, 0x44
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add_ui(R_T0, R_0, bios_table_addr), // addiu $t0, $0, 0xA0
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jump_link(R_T0, R_RA), nop, // jalr $t0, $ra, BD slot
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load_word(R_RA, R_SP, S_(U4)), // lw $ra, 4($sp)
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jump_reg(R_RA), // jr $ra
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add_ui(R_SP, R_SP, MipsStackAlignment), // sp += 8 (BD)
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mac_yield(),
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};
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#pragma endregion Baked Atoms
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