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generated by cgit v1.2.1 (git 2.21.0) at 2024-07-08 00:15:51 +0000
pt">; return 1; } static void insert_block(int i) { memmove( mem_info.blocks + i + 1, mem_info.blocks + i, (mem_info.count - i) * sizeof(struct mem_block)); mem_info.count++; } static void delete_block(int i) { mem_info.count--; memmove( mem_info.blocks + i, mem_info.blocks + i + 1, (mem_info.count - i) * sizeof(struct mem_block)); } void * LRMI_alloc_real(int size) { int i; char *r = (char *)REAL_MEM_BASE; if (!mem_info.ready) return NULL; if (mem_info.count == REAL_MEM_BLOCKS) return NULL; size = (size + 15) & ~15; for (i = 0; i < mem_info.count; i++) { if (mem_info.blocks[i].free && size < mem_info.blocks[i].size) { insert_block(i); mem_info.blocks[i].size = size; mem_info.blocks[i].free = 0; mem_info.blocks[i + 1].size -= size; return (void *)r; } r += mem_info.blocks[i].size; } return NULL; } void LRMI_free_real(void *m) { int i; char *r = (char *)REAL_MEM_BASE; if (!mem_info.ready) return; i = 0; while (m != (void *)r) { r += mem_info.blocks[i].size; i++; if (i == mem_info.count) return; } mem_info.blocks[i].free = 1; if (i + 1 < mem_info.count && mem_info.blocks[i + 1].free) { mem_info.blocks[i].size += mem_info.blocks[i + 1].size; delete_block(i + 1); } if (i - 1 >= 0 && mem_info.blocks[i - 1].free) { mem_info.blocks[i - 1].size += mem_info.blocks[i].size; delete_block(i); } } #define DEFAULT_VM86_FLAGS (IF_MASK | IOPL_MASK) #define DEFAULT_STACK_SIZE 0x1000 #define RETURN_TO_32_INT 255 static struct { int ready; unsigned short ret_seg, ret_off; unsigned short stack_seg, stack_off; struct vm86_struct vm; } context = { 0 }; static inline void set_bit(unsigned int bit, void *array) { unsigned char *a = array; a[bit / 8] |= (1 << (bit % 8)); } static inline unsigned int get_int_seg(int i) { return *(unsigned short *)(i * 4 + 2); } static inline unsigned int get_int_off(int i) { return *(unsigned short *)(i * 4); } static inline void pushw(unsigned short i) { struct vm86_regs *r = &context.vm.regs; r->esp -= 2; *(unsigned short *)(((unsigned int)r->ss << 4) + r->esp) = i; } int LRMI_init(void) { void *m; int fd_mem; if (context.ready) return 1; if (!real_mem_init()) return 0; /* Map the Interrupt Vectors (0x0 - 0x400) + BIOS data (0x400 - 0x502) and the ROM (0xa0000 - 0x100000) */ fd_mem = open("/dev/mem", O_RDWR); if (fd_mem == -1) { perror("open /dev/mem"); return 0; } m = mmap((void *)0, 0x502, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_FIXED | MAP_PRIVATE, fd_mem, 0); if (m == (void *)-1) { perror("mmap /dev/mem"); return 0; } m = mmap((void *)0xa0000, 0x100000 - 0xa0000, PROT_READ | PROT_WRITE, MAP_FIXED | MAP_SHARED, fd_mem, 0xa0000); if (m == (void *)-1) { perror("mmap /dev/mem"); return 0; } /* Allocate a stack */ m = LRMI_alloc_real(DEFAULT_STACK_SIZE); context.stack_seg = (unsigned int)m >> 4; context.stack_off = DEFAULT_STACK_SIZE; /* Allocate the return to 32 bit routine */ m = LRMI_alloc_real(2); context.ret_seg = (unsigned int)m >> 4; context.ret_off = (unsigned int)m & 0xf; ((unsigned char *)m)[0] = 0xcd; /* int opcode */ ((unsigned char *)m)[1] = RETURN_TO_32_INT; memset(&context.vm, 0, sizeof(context.vm)); /* Enable kernel emulation of all ints except RETURN_TO_32_INT */ memset(&context.vm.int_revectored, 0, sizeof(context.vm.int_revectored)); set_bit(RETURN_TO_32_INT, &context.vm.int_revectored); context.ready = 1; return 1; } static void set_regs(struct LRMI_regs *r) { context.vm.regs.edi = r->edi; context.vm.regs.esi = r->esi; context.vm.regs.ebp = r->ebp; context.vm.regs.ebx = r->ebx; context.vm.regs.edx = r->edx; context.vm.regs.ecx = r->ecx; context.vm.regs.eax = r->eax; context.vm.regs.eflags = DEFAULT_VM86_FLAGS; context.vm.regs.es = r->es; context.vm.regs.ds = r->ds; context.vm.regs.fs = r->fs; context.vm.regs.gs = r->gs; } static void get_regs(struct LRMI_regs *r) { r->edi = context.vm.regs.edi; r->esi = context.vm.regs.esi; r->ebp = context.vm.regs.ebp; r->ebx = context.vm.regs.ebx; r->edx = context.vm.regs.edx; r->ecx = context.vm.regs.ecx; r->eax = context.vm.regs.eax; r->flags = context.vm.regs.eflags; r->es = context.vm.regs.es; r->ds = context.vm.regs.ds; r->fs = context.vm.regs.fs; r->gs = context.vm.regs.gs; } #define DIRECTION_FLAG (1 << 10) static void em_ins(int size) { unsigned int edx, edi; edx = context.vm.regs.edx & 0xffff; edi = context.vm.regs.edi & 0xffff; edi += (unsigned int)context.vm.regs.ds << 4; if (context.vm.regs.eflags & DIRECTION_FLAG) { if (size == 4) asm volatile ("std; insl; cld" : "=D" (edi) : "d" (edx), "0" (edi)); else if (size == 2) asm volatile ("std; insw; cld" : "=D" (edi) : "d" (edx), "0" (edi)); else asm volatile ("std; insb; cld" : "=D" (edi) : "d" (edx), "0" (edi)); } else { if (size == 4) asm volatile ("cld; insl" : "=D" (edi) : "d" (edx), "0" (edi)); else if (size == 2) asm volatile ("cld; insw" : "=D" (edi) : "d" (edx), "0" (edi)); else asm volatile ("cld; insb" : "=D" (edi) : "d" (edx), "0" (edi)); } edi -= (unsigned int)context.vm.regs.ds << 4; context.vm.regs.edi &= 0xffff0000; context.vm.regs.edi |= edi & 0xffff; } static void em_rep_ins(int size) { unsigned int ecx, edx, edi; ecx = context.vm.regs.ecx & 0xffff; edx = context.vm.regs.edx & 0xffff; edi = context.vm.regs.edi & 0xffff; edi += (unsigned int)context.vm.regs.ds << 4; if (context.vm.regs.eflags & DIRECTION_FLAG) { if (size == 4) asm volatile ("std; rep; insl; cld" : "=D" (edi), "=c" (ecx) : "d" (edx), "0" (edi), "1" (ecx)); else if (size == 2) asm volatile ("std; rep; insw; cld" : "=D" (edi), "=c" (ecx) : "d" (edx), "0" (edi), "1" (ecx)); else asm volatile ("std; rep; insb; cld" : "=D" (edi), "=c" (ecx) : "d" (edx), "0" (edi), "1" (ecx)); } else { if (size == 4) asm volatile ("cld; rep; insl" : "=D" (edi), "=c" (ecx) : "d" (edx), "0" (edi), "1" (ecx)); else if (size == 2) asm volatile ("cld; rep; insw" : "=D" (edi), "=c" (ecx) : "d" (edx), "0" (edi), "1" (ecx)); else asm volatile ("cld; rep; insb" : "=D" (edi), "=c" (ecx) : "d" (edx), "0" (edi), "1" (ecx)); } edi -= (unsigned int)context.vm.regs.ds << 4; context.vm.regs.edi &= 0xffff0000; context.vm.regs.edi |= edi & 0xffff; context.vm.regs.ecx &= 0xffff0000; context.vm.regs.ecx |= ecx & 0xffff; } static void em_outs(int size) { unsigned int edx, esi; edx = context.vm.regs.edx & 0xffff; esi = context.vm.regs.esi & 0xffff; esi += (unsigned int)context.vm.regs.ds << 4; if (context.vm.regs.eflags & DIRECTION_FLAG) { if (size == 4) asm volatile ("std; outsl; cld" : "=S" (esi) : "d" (edx), "0" (esi)); else if (size == 2) asm volatile ("std; outsw; cld" : "=S" (esi) : "d" (edx), "0" (esi)); else asm volatile ("std; outsb; cld" : "=S" (esi) : "d" (edx), "0" (esi)); } else { if (size == 4) asm volatile ("cld; outsl" : "=S" (esi) : "d" (edx), "0" (esi)); else if (size == 2) asm volatile ("cld; outsw" : "=S" (esi) : "d" (edx), "0" (esi)); else asm volatile ("cld; outsb" : "=S" (esi) : "d" (edx), "0" (esi)); } esi -= (unsigned int)context.vm.regs.ds << 4; context.vm.regs.esi &= 0xffff0000; context.vm.regs.esi |= esi & 0xffff; } static void em_rep_outs(int size) { unsigned int ecx, edx, esi; ecx = context.vm.regs.ecx & 0xffff; edx = context.vm.regs.edx & 0xffff; esi = context.vm.regs.esi & 0xffff; esi += (unsigned int)context.vm.regs.ds << 4; if (context.vm.regs.eflags & DIRECTION_FLAG) { if (size == 4) asm volatile ("std; rep; outsl; cld" : "=S" (esi), "=c" (ecx)