From 7d383cff3cb0680b01c3d48ce7e29babe5f4b50a Mon Sep 17 00:00:00 2001 From: hyenasky Date: Wed, 26 Oct 2022 11:37:27 -0600 Subject: [PATCH] add int instruction, make cross-page accesses work --- src/bus.c | 16 ++++++++ src/cpu.c | 113 ++++++++++++++++++++++++++++++++++++++++++++++++----- src/cpu.h | 4 +- src/main.c | 23 ++++++++--- src/mmu.c | 5 ++- 5 files changed, 144 insertions(+), 17 deletions(-) diff --git a/src/bus.c b/src/bus.c index 92aba43..8f1d655 100644 --- a/src/bus.c +++ b/src/bus.c @@ -7,6 +7,7 @@ #include #include #include +#include #include "bus.h" #include "cpu.h" @@ -15,6 +16,9 @@ #include "keyboard.h" #include "mouse.h" +extern struct timeval rtc_current_time; +extern uint32_t rtc_uptime; + extern fox32_vm_t vm; extern disk_controller_t disk_controller; extern mouse_t mouse; @@ -81,6 +85,18 @@ int bus_io_read(void *user, uint32_t *value, uint32_t port) { break; } + case 0x80000700 ... 0x80000706: { // RTC port + uint8_t setting = port & 0x000000FF; + switch (setting) { + case 0x06: { // ms since startup + *value = rtc_uptime; + break; + } + } + + break; + } + case 0x80001000 ... 0x80002003: { // disk controller port size_t id = port & 0xFF; uint8_t operation = (port & 0x0000F000) >> 8; diff --git a/src/cpu.c b/src/cpu.c index a20e111..c479129 100644 --- a/src/cpu.c +++ b/src/cpu.c @@ -2,6 +2,7 @@ #include #include #include +#include #include "cpu.h" #include "mmu.h" @@ -88,6 +89,7 @@ enum { OP_LOOP = 0x28, OP_RLOOP = 0x29, OP_RET = 0x2A, + OP_INT = 0x2C, OP_TLB = 0x2D, OP_DEC = 0x31, OP_REM = 0x32, @@ -96,7 +98,7 @@ enum { OP_IREM = 0x35, OP_RTA = 0x39, OP_RETI = 0x3A, - OP_FLP = 0x3D + OP_FLP = 0x3D, }; enum { @@ -235,6 +237,7 @@ static const asm_iinfo_t asm_iinfos[256] = { [OP_LOOP ] = { "LOOP ", 1 }, [OP_RLOOP] = { "RLOOP", 1 }, [OP_RET ] = { "RET ", 0 }, + [OP_INT ] = { "INT ", 1 }, [OP_TLB ] = { "TLB ", 1 }, [OP_DEC ] = { "DEC ", 1 }, [OP_REM ] = { "REM ", 2 }, @@ -475,8 +478,78 @@ static uint8_t *vm_findmemory(vm_t *vm, uint32_t address, uint32_t size, bool wr } } +static uint32_t vm_read_across(vm_t *vm, uint32_t address, int size) { + uint32_t result = 0; + + int shift = 0; + + // read the first page + + int bytes = 0x1000 - (address&0xFFF); + uint8_t *ptr = vm_findmemory(vm, address, bytes, false); + + while (bytes) { + result |= (*ptr<>= 8; + + ptr++; + bytes--; + } + + // write the second page + + bytes = (address+size)&0xFFF; + address = (address+size)&0xFFFFF000; + + ptr = vm_findmemory(vm, address, bytes, true); + + while (bytes) { + *ptr = value&0xFF; + value >>= 8; + + ptr++; + bytes--; + } +} + #define VM_READ_BODY(_ptr_get, _size) \ - return _ptr_get(vm_findmemory(vm, address, _size, false)); + if ((address&0xFFFFF000) == ((address+_size-1)&0xFFFFF000)) { \ + return _ptr_get(vm_findmemory(vm, address, _size, false)); \ + } else { \ + return vm_read_across(vm, address, _size); \ + } static uint8_t vm_read8(vm_t *vm, uint32_t address) { VM_READ_BODY(ptr_get8, SIZE8) @@ -489,7 +562,12 @@ static uint32_t vm_read32(vm_t *vm, uint32_t address) { } #define VM_WRITE_BODY(_ptr_set, _size) \ - _ptr_set(vm_findmemory(vm, address, _size, true), value); + if ((address&0xFFFFF000) == ((address+_size-1)&0xFFFFF000)) { \ + return _ptr_set(vm_findmemory(vm, address, _size, true), value); \ + } else { \ + return vm_write_across(vm, address, _size, value); \ + } + static void vm_write8(vm_t *vm, uint32_t address, uint8_t value) { VM_WRITE_BODY(ptr_set8, SIZE8) @@ -502,7 +580,8 @@ static void vm_write32(vm_t *vm, uint32_t address, uint32_t value) { } #define VM_PUSH_BODY(_vm_write, _size) \ - _vm_write(vm, vm->pointer_stack -= _size, value); + _vm_write(vm, vm->pointer_stack - _size, value); \ + vm->pointer_stack -= _size; static void vm_push8(vm_t *vm, uint8_t value) { VM_PUSH_BODY(vm_write8, SIZE8) @@ -515,8 +594,9 @@ static void vm_push32(vm_t *vm, uint32_t value) { } #define VM_POP_BODY(_vm_read, _size) \ - uint32_t pointer_stack_prev = vm->pointer_stack; \ - return _vm_read(vm, (vm->pointer_stack += _size, pointer_stack_prev)); + uint32_t result = _vm_read(vm, vm->pointer_stack); \ + vm->pointer_stack += _size; \ + return result; static uint8_t vm_pop8(vm_t *vm) { VM_POP_BODY(vm_read8, SIZE8) @@ -872,6 +952,9 @@ static void vm_execute(vm_t *vm) { VM_PRELUDE_0(); vm_flags_set(vm, vm_pop8(vm)); vm->pointer_instr_mut = vm_pop32(vm); + if (vm->flag_swap_sp) { + vm->pointer_stack = vm_pop32(vm); + } break; }; @@ -997,6 +1080,14 @@ static void vm_execute(vm_t *vm) { vm->mmu_enabled = false; break; }; + case OP(SZ_WORD, OP_INT): { + VM_PRELUDE_1(SIZE32); + uint32_t intr = vm_source32(vm, instr.source); + vm->pointer_instr = vm->pointer_instr_mut; + fox32_raise(vm, intr); + vm->pointer_instr_mut = vm->pointer_instr; + break; + }; case OP(SZ_WORD, OP_TLB): { VM_PRELUDE_1(SIZE32); set_and_flush_tlb(vm_source32(vm, instr.source)); @@ -1022,14 +1113,18 @@ static err_t vm_step(vm_t *vm) { vm_execute(vm); return FOX32_ERR_OK; } -static err_t vm_resume(vm_t *vm, uint32_t count) { +static err_t vm_resume(vm_t *vm, uint32_t count, uint32_t *executed) { if (setjmp(vm->panic_jmp) != 0) { return vm->halted = true, vm->panic_err; } + + vm->halted = false; + uint32_t remaining = count; while (!vm->halted && remaining > 0) { vm_execute(vm); remaining -= 1; + *executed += 1; } return FOX32_ERR_OK; } @@ -1143,8 +1238,8 @@ void fox32_init(fox32_vm_t *vm) { fox32_err_t fox32_step(fox32_vm_t *vm) { return vm_step(vm); } -fox32_err_t fox32_resume(fox32_vm_t *vm, uint32_t count) { - return vm_resume(vm, count); +fox32_err_t fox32_resume(fox32_vm_t *vm, uint32_t count, uint32_t *executed) { + return vm_resume(vm, count, executed); } fox32_err_t fox32_raise(fox32_vm_t *vm, uint16_t vector) { return vm_raise(vm, vector); diff --git a/src/cpu.h b/src/cpu.h index 919d06a..c05d4ca 100644 --- a/src/cpu.h +++ b/src/cpu.h @@ -5,7 +5,7 @@ #include #include -#define FOX32_CPU_HZ 33000000 +#define FOX32_CPU_HZ 10000000 #define FOX32_MEMORY_RAM 0x04000000 // 64 MiB #define FOX32_MEMORY_ROM 0x00080000 // 512 KiB @@ -77,7 +77,7 @@ typedef struct { void fox32_init(fox32_vm_t *vm); fox32_err_t fox32_step(fox32_vm_t *vm); -fox32_err_t fox32_resume(fox32_vm_t *vm, uint32_t count); +fox32_err_t fox32_resume(fox32_vm_t *vm, uint32_t count, uint32_t *executed); fox32_err_t fox32_raise(fox32_vm_t *vm, uint16_t vector); fox32_err_t fox32_recover(fox32_vm_t *vm, fox32_err_t err); diff --git a/src/main.c b/src/main.c index f9a3d90..a96998f 100644 --- a/src/main.c +++ b/src/main.c @@ -6,6 +6,7 @@ #include #include #include +#include #include "bus.h" #include "cpu.h" @@ -30,6 +31,9 @@ uint32_t tick_end; int ticks = 0; bool done = false; +struct timeval rtc_current_time; +uint32_t rtc_uptime; + void main_loop(void); int main(int argc, char *argv[]) { @@ -95,17 +99,26 @@ void main_loop(void) { fox32_err_t error = FOX32_ERR_OK; for (int i = 0; i < dt; i++) { + rtc_uptime += 1; + gettimeofday(&rtc_current_time, 0); + int cycles_left = cycles_per_tick; if (i == dt - 1) cycles_left += extra_cycles; - error = fox32_resume(&vm, cycles_left); - if (error != FOX32_ERR_OK) { - //puts(fox32_strerr(error)); - error = fox32_recover(&vm, error); - //if (error != FOX32_ERR_OK) + while (cycles_left > 0) { + uint32_t executed = 0; + + error = fox32_resume(&vm, cycles_left, &executed); + if (error != FOX32_ERR_OK) { //puts(fox32_strerr(error)); + error = fox32_recover(&vm, error); + if (error != FOX32_ERR_OK) + break; + } + + cycles_left -= executed; } } diff --git a/src/mmu.c b/src/mmu.c index fc36b87..4cf3ec3 100644 --- a/src/mmu.c +++ b/src/mmu.c @@ -15,13 +15,16 @@ mmu_page_t mmu_tlb[64]; extern fox32_vm_t vm; +uint32_t replacement_index = 0; + static size_t find_free_tlb_entry_index() { for (size_t i = 0; i < 64; i++) { if (!mmu_tlb[i].present) { return i; } } - return 0; + + return (replacement_index++)&63; } void set_and_flush_tlb(uint32_t virtual_address) {