72 lines
1.5 KiB
C
72 lines
1.5 KiB
C
// The OS/K Team licences this file to you under the MIT license.
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// See the LICENSE file in the project root for more information.
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#include "arch.h"
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// Boot firware, loaded at MEMOFF (1MB)
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ushort fwprog[] = {
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I_MOV_R_I, RBP, A_IMM32, FWSTACK>>16, FWSTACK&0xFF,
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I_MOV_R_I, RSP, A_IMM32, FWSTACK>>16, FWSTACK&0xFF,
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I_CALL_I, A_IMM32, (MEMOFF+0x13)>>16, (MEMOFF+0x13)&0xFF,
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I_ADD_R_I, RAX, A_IMM16, 1,
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I_STOP,
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I_ADD_R_I, RBX, A_IMM16, 1,
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I_RET,
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/*
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I_MOV_M_I, A_MEM, RBP, A_IMM16, 0xAC,
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I_SUB_R_I, RBP, A_IMM16, 8,
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I_ADD_M_R, A_OFF, 8, RBP, RSP,
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I_MOV_R_M, RAX, A_MEM, RBP,
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*/
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};
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ushort bget(ctx_t *ctx)
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{
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if (addr2real(ctx->r[RIP].val) >= MEMSIZE) {
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_except(ctx, E_ACC, "Executing out of memory: 0x%016lX",
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ctx->r[RIP].val);
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}
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ushort c = ctx->mp[addr2real(ctx->r[RIP].val)];
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ctx->r[RIP].val++;
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return c;
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}
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extern reg_t arch_r[NREGS];
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extern instr_t arch_i[NINSTRS];
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int main(void)
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{
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static ctx_t main_ctx;
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main_ctx.r = arch_r;
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main_ctx.i = arch_i;
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main_ctx.mp = malloc(MEMSIZE);
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main_ctx.mz = MEMSIZE;
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main_ctx.get = bget;
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main_ctx.r[RIP].val = MEMOFF;
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if (main_ctx.mp == 0) {
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log("Couldn't allocate RAM");
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exit(-1);
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}
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memcpy(&main_ctx.mp[addr2real(main_ctx.r[RIP].val)], fwprog, sizeof(fwprog));
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memset(&main_ctx.mp[addr2real(main_ctx.r[RIP].val) + sizeof(fwprog)/2], 0xFF, 0xFF);
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while (1) {
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decode(&main_ctx);
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}
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return 0;
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}
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