// The OS/K Team licenses this file to you under the MIT license. // See the LICENSE file in the project root for more information. #include //----------------------------------------------------------------------------// #define MAX_RFRAME_IDX 255 // // Register frames // ulong **rfs = NULL; size_t rfs_used = 0; size_t rfs_current_idx = 0; #define CHK_INDEX(idx) \ if ((size_t)idx > MAX_RFRAME_IDX) \ _except(ctx, E_UDF, "cpudev: invalid rframe index: #%u", idx); #define CHK_FRAME(idx) \ CHK_INDEX(idx); \ if (rfs[idx] == NULL) \ _except(ctx, E_UDF, \ "cpudev: operation on inactive reframe #%u", idx); //----------------------------------------------------------------------------// long cpudev_getmaxidx(ctx_t *ctx, dev_t *dev) { rax = MAX_RFRAME_IDX; return 0; } long cpudev_getrfusage(ctx_t *ctx, dev_t *dev) { rax = rfs_used; return 0; } long cpudev_getcuridx(ctx_t *ctx, dev_t *dev) { rax = rfs_current_idx; return 0; } long cpudev_leastavail(ctx_t *ctx, dev_t *dev) { size_t it; for (it = 0; it <= MAX_RFRAME_IDX; it++) { if (rfs[it] == NULL) { rax = it; return 0; } } rax = -1; return 0; } //----------------------------------------------------------------------------// long cpudev_isactive(ctx_t *ctx, dev_t *dev) { CHK_INDEX(ax0); rax = (rfs[ax0] != NULL); return 0; } long cpudev_activate(ctx_t *ctx, dev_t *dev) { CHK_INDEX(ax0); if (rfs[ax0] != NULL) _except(ctx, E_UDF, "cpudev: activating already activated rframe: #%u", ax0); rfs[ax0] = calloc(NREGS, sizeof(ulong)); if (rfs[ax0] == 0) return -1; rfs_used++; return 0; } long cpudev_deactivate(ctx_t *ctx, dev_t *dev) { CHK_FRAME(ax0); if (ax0 == 0) _except(ctx, E_UDF, "cpudev: deactivating rframe #0"); free(rfs[ax0]); rfs[ax0] = NULL; rfs_used--; assert(rfs_used > 0); return 0; } //----------------------------------------------------------------------------// long cpudev_copyframe(ctx_t *ctx, dev_t *dev) { CHK_FRAME(ax0); CHK_FRAME(ax1); if (ax0 == ax1) return -1; memcpy(rfs[ax0], rfs[ax1], NREGS * sizeof(ulong)); return 0; } long cpudev_moveframe(ctx_t *ctx, dev_t *dev) { CHK_INDEX(ax0); CHK_FRAME(ax1); if (ax1 == 0) _except(ctx, E_UDF, "cpudev: trying to move frame #0"); if (rfs[ax0] != NULL) _except(ctx, E_UDF, "cpudev: trying to move frame #%u " "active frame #%u", ax1, ax0); rfs[ax0] = rfs[ax1]; rfs[ax1] = NULL; return 0; } long cpudev_switchframe(ctx_t *ctx, dev_t *dev) { CHK_FRAME(ax0); rfs_current_idx = ax0; ctx->rf = rfs[ax0]; return 0; } //----------------------------------------------------------------------------// long cpudev_loadargs(ctx_t *ctx, dev_t *dev) { CHK_FRAME(ax0); R(AX5) = rfs[ax0][AX5]; R(AX4) = rfs[ax0][AX4]; R(AX3) = rfs[ax0][AX3]; R(AX2) = rfs[ax0][AX2]; R(AX1) = rfs[ax0][AX1]; R(AX0) = rfs[ax0][AX0]; return 0; } long cpudev_loadreg(ctx_t *ctx, dev_t *dev) { CHK_FRAME(ax0); if ((ushort)ax1 >= NREGS || ax1 == RZX) _except(ctx, E_UDF, "cpudev: register invalid or index out of range: #%u", ax1); R(RAX) = rfs[ax0][ax1]; return 0; } long cpudev_storereg(ctx_t *ctx, dev_t *dev) { CHK_FRAME(ax0); if ((ushort)ax1 >= NREGS) _except(ctx, E_UDF, "cpudev: register index out of range: #%u", ax1); rfs[ax0][ax1] = R(AX2); return 0; } //----------------------------------------------------------------------------// #define CHK_IDT_INDEX(idx) \ if ((ulong)idx >= IDT_SLOTS) \ _except(ctx, E_UDF, "cpudev: invalid IDT slot index: #%u", idx); /* except.h */ ulong idt[IDT_SLOTS] = { 0 }; bool idt_masked[IDT_SLOTS] = { 0 }; // deliberately masked by software bool idt_handling[IDT_SLOTS] = { 0 }; // a handler is already running long cpudev_idtadd(ctx_t *ctx, dev_t *dev) { CHK_FRAME(ax1); CHK_IDT_INDEX(ax0); if (idt[ax0] != 0) _except(ctx, E_UDF, "cpudev: IDT slot index already in use: #%u", ax0); assert(idt_handling[ax0] == 0); idt[ax0] = ax1; return 0; } long cpudev_idtdel(ctx_t *ctx, dev_t *dev) { CHK_IDT_INDEX(ax0); if (idt[ax0] == 0) _except(ctx, E_UDF, "cpudev: IDT slot index not in use: #%u", ax0); idt[ax0] = 0; idt_handling[ax0] = 0; return 0; } long cpudev_idtquery(ctx_t *ctx, dev_t *dev) { if (ax0 >= IDT_SLOTS || idt[ax0] == 0) rax = rdx = 0; else { rax = 1; rdx = idt[ax0]; } return 0; } long cpudev_idtdone(ctx_t *ctx, dev_t *dev) { CHK_IDT_INDEX(ax0); if (idt_handling[ax0] == 0) _except(ctx, E_UDF, "cpudev: idtdone, not handling E/I #%u", ax0); idt_handling[ax0]--; return 0; } //----------------------------------------------------------------------------// long cpudev_poweron(ctx_t *ctx, dev_t *dev) { rfs = calloc(MAX_RFRAME_IDX + 2, sizeof(reg_t *)); if (rfs == NULL) return -1; rfs[0] = ctx->rf; rfs_used = 1; dev->state = DEVGOOD; dev->fslots[16] = cpudev_getmaxidx; dev->fslots[17] = cpudev_getrfusage; dev->fslots[18] = cpudev_getcuridx; dev->fslots[19] = cpudev_leastavail; dev->fslots[20] = cpudev_isactive; dev->fslots[21] = cpudev_activate; dev->fslots[22] = cpudev_deactivate; dev->fslots[23] = cpudev_copyframe; dev->fslots[24] = cpudev_moveframe; dev->fslots[25] = cpudev_switchframe; dev->fslots[32] = cpudev_loadargs; dev->fslots[33] = cpudev_loadreg; dev->fslots[48] = cpudev_storereg; dev->fslots[64] = cpudev_idtadd; dev->fslots[65] = cpudev_idtdel; dev->fslots[66] = cpudev_idtquery; dev->fslots[67] = cpudev_idtdone; return 0; } long cpudev_poweroff(ctx_t *ctx, dev_t *dev) { size_t i; if (rfs) { for (i = 0; i <= MAX_RFRAME_IDX; i++) free(rfs[i]); free(rfs); } dev->state = DEVPWOF; return 0; } //----------------------------------------------------------------------------// dev_t cpudev = { .type = "cpu", .name = "K-CPU", .modl = "Prisma 1", .vend = "The OS/K Team", .major = KARCH_MAJOR, .minor = KARCH_MINOR, .revis = KARCH_REVIS, .fpwon = cpudev_poweron, .fpwoff = cpudev_poweroff, };