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| author | Kimplul <kimi.h.kuparinen@gmail.com> | 2024-01-21 23:10:36 +0200 |
|---|---|---|
| committer | Kimplul <kimi.h.kuparinen@gmail.com> | 2024-01-21 23:10:36 +0200 |
| commit | a152fbd956cc9cb9c05a233abe004ba3d12767a0 (patch) | |
| tree | 458a7812ae3c4d5c4999d7f9650e2ee1c05c9ba6 /triscv/src/cpu.c | |
| parent | 910ad02d86672cc3020cc5df0fa451ef4dd69bfd (diff) | |
| download | tri-a152fbd956cc9cb9c05a233abe004ba3d12767a0.tar.gz tri-a152fbd956cc9cb9c05a233abe004ba3d12767a0.zip | |
start working on virtual memory
Diffstat (limited to 'triscv/src/cpu.c')
| -rw-r--r-- | triscv/src/cpu.c | 25 |
1 files changed, 11 insertions, 14 deletions
diff --git a/triscv/src/cpu.c b/triscv/src/cpu.c index a7213bb..a47ec78 100644 --- a/triscv/src/cpu.c +++ b/triscv/src/cpu.c @@ -27,23 +27,20 @@ struct cpu { tri_t csrw[19683]; }; -static size_t get_csr_num(tri_t csr) +tri_t get_csr(struct cpu *cpu, long i) { - return tri_to(csr) + 9841; -} - -static tri_t get_csr(struct cpu *cpu, size_t i) -{ - size_t max_csr = cpu->mode * 6561; + i += 9841; + long max_csr = cpu->mode * 6561; if (i < max_csr) return 0; /* illegal access, should maybe also raise an interrupt? */ return cpu->csr[i]; } -static void set_csr(struct cpu *cpu, size_t i, tri_t t) +void set_csr(struct cpu *cpu, long i, tri_t t) { - size_t max_csr = cpu->mode * 6561; + i += 9841; + long max_csr = cpu->mode * 6561; if (i < max_csr) return; @@ -78,8 +75,8 @@ static void set_gpr(struct cpu *cpu, tri_t i, tri_t t) static void csr_init(struct cpu *cpu) { - cpu->csr[CSR_MPOWER] = 0; - cpu->csrw[CSR_MPOWER] = RW_MPOWER; + cpu->csrw[CSR_MPOWER + 9841] = RW_MPOWER; + set_csr(cpu, CSR_MPOWER, 0); } struct cpu *cpu_create(struct mmu *mmu, struct tmb *tmb) @@ -127,7 +124,7 @@ static void do_system(struct cpu *cpu, tri_t i) switch (fn0) { case SYSTEM_CSRRW: { /* read existing value and replace it with rs1 */ - size_t n = get_csr_num(imm9); + long n = tri_to(imm9); tri_t c = get_csr(cpu, n); set_csr(cpu, n, src); set_gpr(cpu, rd, c); @@ -215,8 +212,8 @@ void cpu_run(struct cpu *cpu, vm_t start) cpu->pc = start; /* run while the shutdown trit is zero */ - while (!(cpu->csr[CSR_MPOWER] & 0b1100)) { - tri_t i = mmu_read3(cpu, cpu->mmu, cpu->pc); + while (!(get_csr(cpu, CSR_MPOWER) & 0b1100)) { + tri_t i = mmu_read_pc(cpu, cpu->mmu, cpu->pc); /** @todo check for raised interrupts, illegal addr etc. */ /* check lowest five trits to determine opcode */ |