| // Coreboot interface support. |
| // |
| // Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net> |
| // |
| // This file may be distributed under the terms of the GNU LGPLv3 license. |
| |
| #include "memmap.h" // add_e820 |
| #include "util.h" // dprintf |
| #include "pci.h" // struct pir_header |
| #include "acpi.h" // struct rsdp_descriptor |
| #include "mptable.h" // MPTABLE_SIGNATURE |
| #include "biosvar.h" // GET_EBDA |
| |
| |
| /**************************************************************** |
| * BIOS table copying |
| ****************************************************************/ |
| |
| static void |
| copy_pir(void *pos) |
| { |
| struct pir_header *p = pos; |
| if (p->signature != PIR_SIGNATURE) |
| return; |
| if (PirOffset) |
| return; |
| if (p->size < sizeof(*p)) |
| return; |
| if (checksum(pos, p->size) != 0) |
| return; |
| bios_table_cur_addr = ALIGN(bios_table_cur_addr, 16); |
| if (bios_table_cur_addr + p->size > bios_table_end_addr) { |
| dprintf(1, "No room to copy PIR table!\n"); |
| return; |
| } |
| dprintf(1, "Copying PIR from %p to %x\n", pos, bios_table_cur_addr); |
| memcpy((void*)bios_table_cur_addr, pos, p->size); |
| PirOffset = bios_table_cur_addr - BUILD_BIOS_ADDR; |
| bios_table_cur_addr += p->size; |
| } |
| |
| static void |
| copy_mptable(void *pos) |
| { |
| struct mptable_floating_s *p = pos; |
| if (p->signature != MPTABLE_SIGNATURE) |
| return; |
| if (!p->physaddr) |
| return; |
| if (checksum(pos, sizeof(*p)) != 0) |
| return; |
| u32 length = p->length * 16; |
| bios_table_cur_addr = ALIGN(bios_table_cur_addr, 16); |
| u16 mpclength = ((struct mptable_config_s *)p->physaddr)->length; |
| if (bios_table_cur_addr + length + mpclength > bios_table_end_addr) { |
| dprintf(1, "No room to copy MPTABLE!\n"); |
| return; |
| } |
| dprintf(1, "Copying MPTABLE from %p/%x to %x\n" |
| , pos, p->physaddr, bios_table_cur_addr); |
| memcpy((void*)bios_table_cur_addr, pos, length); |
| struct mptable_floating_s *newp = (void*)bios_table_cur_addr; |
| newp->physaddr = bios_table_cur_addr + length; |
| newp->checksum = 0; |
| newp->checksum = -checksum(newp, sizeof(*newp)); |
| memcpy((void*)bios_table_cur_addr + length, (void*)p->physaddr, mpclength); |
| bios_table_cur_addr += length + mpclength; |
| } |
| |
| static void |
| copy_acpi_rsdp(void *pos) |
| { |
| if (RsdpAddr) |
| return; |
| struct rsdp_descriptor *p = pos; |
| if (p->signature != RSDP_SIGNATURE) |
| return; |
| u32 length = 20; |
| if (checksum(pos, length) != 0) |
| return; |
| if (p->revision > 1) { |
| length = p->length; |
| if (checksum(pos, length) != 0) |
| return; |
| } |
| bios_table_cur_addr = ALIGN(bios_table_cur_addr, 16); |
| if (bios_table_cur_addr + length > bios_table_end_addr) { |
| dprintf(1, "No room to copy ACPI RSDP table!\n"); |
| return; |
| } |
| dprintf(1, "Copying ACPI RSDP from %p to %x\n", pos, bios_table_cur_addr); |
| RsdpAddr = (void*)bios_table_cur_addr; |
| memcpy(RsdpAddr, pos, length); |
| bios_table_cur_addr += length; |
| } |
| |
| // Attempt to find (and relocate) any standard bios tables found in a |
| // given address range. |
| static void |
| scan_tables(u32 start, u32 size) |
| { |
| void *p = (void*)ALIGN(start, 16); |
| void *end = (void*)start + size; |
| for (; p<end; p += 16) { |
| copy_pir(p); |
| copy_mptable(p); |
| copy_acpi_rsdp(p); |
| } |
| } |
| |
| |
| /**************************************************************** |
| * Memory map |
| ****************************************************************/ |
| |
| struct cb_header { |
| u32 signature; |
| u32 header_bytes; |
| u32 header_checksum; |
| u32 table_bytes; |
| u32 table_checksum; |
| u32 table_entries; |
| }; |
| |
| #define CB_SIGNATURE 0x4f49424C // "LBIO" |
| |
| struct cb_memory_range { |
| u64 start; |
| u64 size; |
| u32 type; |
| }; |
| |
| #define CB_MEM_TABLE 16 |
| |
| struct cb_memory { |
| u32 tag; |
| u32 size; |
| struct cb_memory_range map[0]; |
| }; |
| |
| #define CB_TAG_MEMORY 0x01 |
| |
| #define MEM_RANGE_COUNT(_rec) \ |
| (((_rec)->size - sizeof(*(_rec))) / sizeof((_rec)->map[0])) |
| |
| struct cb_forward { |
| u32 tag; |
| u32 size; |
| u64 forward; |
| }; |
| |
| #define CB_TAG_FORWARD 0x11 |
| |
| static u16 |
| ipchksum(char *buf, int count) |
| { |
| u16 *p = (u16*)buf; |
| u32 sum = 0; |
| while (count > 1) { |
| sum += *p++; |
| count -= 2; |
| } |
| if (count) |
| sum += *(u8*)p; |
| sum = (sum >> 16) + (sum & 0xffff); |
| sum += (sum >> 16); |
| return ~sum; |
| } |
| |
| // Try to locate the coreboot header in a given address range. |
| static struct cb_header * |
| find_cb_header(char *addr, int len) |
| { |
| char *end = addr + len; |
| for (; addr < end; addr += 16) { |
| struct cb_header *cbh = (struct cb_header *)addr; |
| if (cbh->signature != CB_SIGNATURE) |
| continue; |
| if (! cbh->table_bytes) |
| continue; |
| if (ipchksum(addr, sizeof(*cbh)) != 0) |
| continue; |
| if (ipchksum(addr + sizeof(*cbh), cbh->table_bytes) |
| != cbh->table_checksum) |
| continue; |
| return cbh; |
| } |
| return NULL; |
| } |
| |
| // Try to find the coreboot memory table in the given coreboot table. |
| static void * |
| find_cb_subtable(struct cb_header *cbh, u32 tag) |
| { |
| char *tbl = (char *)cbh + sizeof(*cbh); |
| int i; |
| for (i=0; i<cbh->table_entries; i++) { |
| struct cb_memory *cbm = (struct cb_memory *)tbl; |
| tbl += cbm->size; |
| if (cbm->tag == tag) |
| return cbm; |
| } |
| return NULL; |
| } |
| |
| // Populate max ram and e820 map info by scanning for a coreboot table. |
| static void |
| coreboot_fill_map() |
| { |
| dprintf(3, "Attempting to find coreboot table\n"); |
| |
| // Init variables set in coreboot table memory scan. |
| PirOffset = 0; |
| RsdpAddr = 0; |
| |
| // Find coreboot table. |
| struct cb_header *cbh = find_cb_header(0, 0x1000); |
| if (!cbh) |
| goto fail; |
| struct cb_forward *cbf = find_cb_subtable(cbh, CB_TAG_FORWARD); |
| if (cbf) { |
| dprintf(3, "Found coreboot table forwarder.\n"); |
| cbh = find_cb_header((char *)((u32)cbf->forward), 0x100); |
| if (!cbh) |
| goto fail; |
| } |
| dprintf(3, "Now attempting to find coreboot memory map\n"); |
| struct cb_memory *cbm = find_cb_subtable(cbh, CB_TAG_MEMORY); |
| if (!cbm) |
| goto fail; |
| |
| u64 maxram = 0, maxram_over4G = 0; |
| int i, count = MEM_RANGE_COUNT(cbm); |
| for (i=0; i<count; i++) { |
| struct cb_memory_range *m = &cbm->map[i]; |
| u32 type = m->type; |
| if (type == CB_MEM_TABLE) { |
| type = E820_RESERVED; |
| scan_tables(m->start, m->size); |
| } else if (type == E820_ACPI || type == E820_RAM) { |
| u64 end = m->start + m->size; |
| if (end > 0x100000000ull) { |
| end -= 0x100000000ull; |
| if (end > maxram_over4G) |
| maxram_over4G = end; |
| } else if (end > maxram) |
| maxram = end; |
| } |
| add_e820(m->start, m->size, type); |
| } |
| |
| RamSize = maxram; |
| RamSizeOver4G = maxram_over4G; |
| |
| // Ughh - coreboot likes to set a map at 0x0000-0x1000, but this |
| // confuses grub. So, override it. |
| add_e820(0, 16*1024, E820_RAM); |
| |
| // XXX - just create dummy smbios table for now - should detect if |
| // smbios/dmi table is found from coreboot and use that instead. |
| smbios_init(); |
| |
| return; |
| |
| fail: |
| // No table found.. Use 16Megs as a dummy value. |
| dprintf(1, "Unable to find coreboot table!\n"); |
| RamSize = 16*1024*1024; |
| RamSizeOver4G = 0; |
| add_e820(0, 16*1024*1024, E820_RAM); |
| return; |
| } |
| |
| |
| /**************************************************************** |
| * Coreboot flash format |
| ****************************************************************/ |
| |
| // XXX - optimize |
| #define ntohl(x) ((((x)&0xff)<<24) | (((x)&0xff00)<<8) | \ |
| (((x)&0xff0000) >> 8) | (((x)&0xff000000) >> 24)) |
| #define htonl(x) ntohl(x) |
| |
| #define CBFS_HEADER_MAGIC 0x4F524243 |
| #define CBFS_HEADPTR_ADDR 0xFFFFFFFc |
| #define CBFS_VERSION1 0x31313131 |
| |
| struct cbfs_header { |
| u32 magic; |
| u32 version; |
| u32 romsize; |
| u32 bootblocksize; |
| u32 align; |
| u32 offset; |
| u32 pad[2]; |
| } PACKED; |
| |
| static struct cbfs_header *CBHDR; |
| |
| static void |
| cbfs_setup() |
| { |
| if (! CONFIG_COREBOOT_FLASH) |
| return; |
| |
| CBHDR = *(void **)CBFS_HEADPTR_ADDR; |
| if (CBHDR->magic != htonl(CBFS_HEADER_MAGIC)) { |
| dprintf(1, "Unable to find CBFS (got %x not %x)\n" |
| , CBHDR->magic, htonl(CBFS_HEADER_MAGIC)); |
| CBHDR = NULL; |
| return; |
| } |
| |
| dprintf(1, "Found CBFS header at %p\n", CBHDR); |
| } |
| |
| #define CBFS_FILE_MAGIC 0x455649484352414cLL // LARCHIVE |
| |
| struct cbfs_file { |
| u64 magic; |
| u32 len; |
| u32 type; |
| u32 checksum; |
| u32 offset; |
| char filename[0]; |
| } PACKED; |
| |
| static struct cbfs_file * |
| cbfs_search(struct cbfs_file *file) |
| { |
| for (;;) { |
| if (file < (struct cbfs_file *)(0xFFFFFFFF - ntohl(CBHDR->romsize))) |
| return NULL; |
| if (file->magic == CBFS_FILE_MAGIC) |
| return file; |
| file = (void*)file + ntohl(CBHDR->align); |
| } |
| } |
| |
| static struct cbfs_file * |
| cbfs_getfirst() |
| { |
| if (! CBHDR) |
| return NULL; |
| return cbfs_search((void *)(0 - ntohl(CBHDR->romsize) + ntohl(CBHDR->offset))); |
| } |
| |
| static struct cbfs_file * |
| cbfs_getnext(struct cbfs_file *file) |
| { |
| file = (void*)file + ALIGN(ntohl(file->len) + ntohl(file->offset), ntohl(CBHDR->align)); |
| return cbfs_search(file); |
| } |
| |
| static struct cbfs_file * |
| cbfs_findfile(const char *fname) |
| { |
| if (! CONFIG_COREBOOT_FLASH) |
| return NULL; |
| |
| dprintf(3, "Searching CBFS for %s\n", fname); |
| struct cbfs_file *file; |
| for (file = cbfs_getfirst(); file; file = cbfs_getnext(file)) { |
| dprintf(3, "Found CBFS file %s\n", file->filename); |
| if (strcmp(fname, file->filename) == 0) |
| return file; |
| } |
| return NULL; |
| } |
| |
| const char * |
| cbfs_findNprefix(const char *prefix, int n) |
| { |
| if (! CONFIG_COREBOOT_FLASH) |
| return NULL; |
| |
| dprintf(3, "Searching CBFS for prefix %s\n", prefix); |
| int len = strlen(prefix); |
| struct cbfs_file *file; |
| for (file = cbfs_getfirst(); file; file = cbfs_getnext(file)) { |
| dprintf(3, "Found CBFS file %s\n", file->filename); |
| if (memcmp(prefix, file->filename, len) == 0) { |
| if (n <= 0) |
| return file->filename; |
| n--; |
| } |
| } |
| return NULL; |
| } |
| |
| static char |
| getHex(u8 x) |
| { |
| if (x <= 9) |
| return '0' + x; |
| return 'a' + x - 10; |
| } |
| |
| static u32 |
| hexify4(u16 x) |
| { |
| return ((getHex(x&0xf) << 24) |
| | (getHex((x>>4)&0xf) << 16) |
| | (getHex((x>>8)&0xf) << 8) |
| | (getHex(x>>12))); |
| } |
| |
| void * |
| cb_find_optionrom(u32 vendev) |
| { |
| if (! CONFIG_COREBOOT_FLASH) |
| return NULL; |
| |
| char fname[17]; |
| // Ughh - poor man's sprintf of "pci%04x,%04x.rom" |
| *(u32*)fname = 0x20696370; // "pci " |
| *(u32*)&fname[3] = hexify4(vendev); |
| fname[7] = ','; |
| *(u32*)&fname[8] = hexify4(vendev >> 16); |
| *(u32*)&fname[12] = 0x6d6f722e; // ".rom" |
| fname[16] = '\0'; |
| |
| struct cbfs_file *file = cbfs_findfile(fname); |
| if (!file) |
| return NULL; |
| // Found it. |
| dprintf(3, "Found rom at %p\n", (void*)file + ntohl(file->offset)); |
| return (void*)file + ntohl(file->offset); |
| } |
| |
| struct cbfs_payload_segment { |
| u32 type; |
| u32 compression; |
| u32 offset; |
| u64 load_addr; |
| u32 len; |
| u32 mem_len; |
| } PACKED; |
| |
| #define PAYLOAD_SEGMENT_BSS 0x20535342 |
| #define PAYLOAD_SEGMENT_ENTRY 0x52544E45 |
| |
| #define CBFS_COMPRESS_NONE 0 |
| |
| struct cbfs_payload { |
| struct cbfs_payload_segment segments[1]; |
| }; |
| |
| void |
| cbfs_run_payload(const char *filename) |
| { |
| dprintf(1, "Run %s\n", filename); |
| struct cbfs_file *file = cbfs_findfile(filename); |
| if (!file) |
| return; |
| struct cbfs_payload *pay = (void*)file + ntohl(file->offset); |
| struct cbfs_payload_segment *seg = pay->segments; |
| for (;;) { |
| if (seg->compression != htonl(CBFS_COMPRESS_NONE)) { |
| dprintf(1, "No support for compressed payloads (%x)\n" |
| , seg->compression); |
| return; |
| } |
| void *src = (void*)pay + ntohl(seg->offset); |
| void *dest = (void*)ntohl((u32)seg->load_addr); |
| u32 src_len = ntohl(seg->len); |
| u32 dest_len = ntohl(seg->mem_len); |
| switch (seg->type) { |
| case PAYLOAD_SEGMENT_BSS: |
| dprintf(3, "BSS segment %d@%p\n", dest_len, dest); |
| memset(dest, 0, dest_len); |
| break; |
| case PAYLOAD_SEGMENT_ENTRY: { |
| dprintf(1, "Calling addr %p\n", dest); |
| void (*func)() = dest; |
| func(); |
| return; |
| } |
| default: |
| dprintf(3, "Segment %x %d@%p -> %d@%p\n" |
| , seg->type, src_len, src, dest_len, dest); |
| if (src_len > dest_len) |
| src_len = dest_len; |
| memcpy(dest, src, src_len); |
| if (dest_len > src_len) |
| memset(dest + src_len, 0, dest_len - src_len); |
| break; |
| } |
| seg++; |
| } |
| } |
| |
| void |
| coreboot_setup(void) |
| { |
| coreboot_fill_map(); |
| cbfs_setup(); |
| } |