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// Support for manipulating bios tables (pir, mptable, acpi, smbios).
//
// Copyright (C) 2008,2009 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU LGPLv3 license.
#include "byteorder.h" // le32_to_cpu
#include "config.h" // CONFIG_*
#include "malloc.h" // malloc_fseg
#include "output.h" // dprintf
#include "hw/pci.h" // pci_config_writeb
#include "std/acpi.h" // struct rsdp_descriptor
#include "std/mptable.h" // MPTABLE_SIGNATURE
#include "std/pirtable.h" // struct pir_header
#include "std/smbios.h" // struct smbios_entry_point
#include "romfile.h"
#include "string.h" // memcpy
#include "util.h" // copy_table
#include "x86.h" // outb
struct pir_header *PirAddr VARFSEG;
void
copy_pir(void *pos)
{
struct pir_header *p = pos;
if (p->signature != PIR_SIGNATURE)
return;
if (PirAddr)
return;
if (p->size < sizeof(*p))
return;
if (checksum(pos, p->size) != 0)
return;
void *newpos = malloc_fseg(p->size);
if (!newpos) {
warn_noalloc();
return;
}
dprintf(1, "Copying PIR from %p to %p\n", pos, newpos);
memcpy(newpos, pos, p->size);
PirAddr = newpos;
}
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;
u16 mpclength = ((struct mptable_config_s *)p->physaddr)->length;
// Allocate final memory location. (In theory the config
// structure can go in high memory, but Linux kernels before
// v2.6.30 crash with that.)
struct mptable_floating_s *newpos = malloc_fseg(length + mpclength);
if (!newpos) {
warn_noalloc();
return;
}
dprintf(1, "Copying MPTABLE from %p/%x to %p\n", pos, p->physaddr, newpos);
memcpy(newpos, pos, length);
newpos->physaddr = (u32)newpos + length;
newpos->checksum -= checksum(newpos, sizeof(*newpos));
memcpy((void*)newpos + length, (void*)p->physaddr, mpclength);
}
/****************************************************************
* ACPI
****************************************************************/
static int
get_acpi_rsdp_length(void *pos, unsigned size)
{
struct rsdp_descriptor *p = pos;
if (p->signature != RSDP_SIGNATURE)
return -1;
u32 length = 20;
if (length > size)
return -1;
if (checksum(pos, length) != 0)
return -1;
if (p->revision > 1) {
length = p->length;
if (length > size)
return -1;
if (checksum(pos, length) != 0)
return -1;
}
return length;
}
struct rsdp_descriptor *RsdpAddr;
void
copy_acpi_rsdp(void *pos)
{
if (RsdpAddr)
return;
int length = get_acpi_rsdp_length(pos, -1);
if (length < 0)
return;
void *newpos = malloc_fseg(length);
if (!newpos) {
warn_noalloc();
return;
}
dprintf(1, "Copying ACPI RSDP from %p to %p\n", pos, newpos);
memcpy(newpos, pos, length);
RsdpAddr = newpos;
}
void *find_acpi_rsdp(void)
{
extern u8 zonefseg_start[], zonefseg_end[];
unsigned long start = (unsigned long)zonefseg_start;
unsigned long end = (unsigned long)zonefseg_end;
unsigned long pos;
for (pos = ALIGN(start, 0x10); pos <= ALIGN_DOWN(end, 0x10); pos += 0x10)
if (get_acpi_rsdp_length((void *)pos, end - pos) >= 0)
return (void *)pos;
return NULL;
}
static struct fadt_descriptor_rev1 *
find_fadt(void)
{
dprintf(4, "rsdp=%p\n", RsdpAddr);
if (!RsdpAddr || RsdpAddr->signature != RSDP_SIGNATURE)
return NULL;
struct rsdt_descriptor_rev1 *rsdt = (void*)RsdpAddr->rsdt_physical_address;
dprintf(4, "rsdt=%p\n", rsdt);
if (!rsdt || rsdt->signature != RSDT_SIGNATURE)
return NULL;
void *end = (void*)rsdt + rsdt->length;
int i;
for (i=0; (void*)&rsdt->table_offset_entry[i] < end; i++) {
struct fadt_descriptor_rev1 *fadt = (void*)rsdt->table_offset_entry[i];
if (!fadt || fadt->signature != FACP_SIGNATURE)
continue;
dprintf(4, "fadt=%p\n", fadt);
return fadt;
}
dprintf(4, "no fadt found\n");
return NULL;
}
u32
find_resume_vector(void)
{
struct fadt_descriptor_rev1 *fadt = find_fadt();
if (!fadt)
return 0;
struct facs_descriptor_rev1 *facs = (void*)fadt->firmware_ctrl;
dprintf(4, "facs=%p\n", facs);
if (! facs || facs->signature != FACS_SIGNATURE)
return 0;
// Found it.
dprintf(4, "resume addr=%d\n", facs->firmware_waking_vector);
return facs->firmware_waking_vector;
}
static struct acpi_20_generic_address acpi_reset_reg;
static u8 acpi_reset_val;
u32 acpi_pm1a_cnt VARFSEG;
u16 acpi_pm_base = 0xb000;
#define acpi_ga_to_bdf(addr) pci_to_bdf(0, (addr >> 32) & 0xffff, (addr >> 16) & 0xffff)
void
acpi_reboot(void)
{
// Check it passed the sanity checks in acpi_set_reset_reg() and was set
if (acpi_reset_reg.register_bit_width != 8)
return;
u64 addr = le64_to_cpu(acpi_reset_reg.address);
dprintf(1, "ACPI hard reset %d:%llx (%x)\n",
acpi_reset_reg.address_space_id, addr, acpi_reset_val);
switch (acpi_reset_reg.address_space_id) {
case 0: // System Memory
writeb((void *)(u32)addr, acpi_reset_val);
break;
case 1: // System I/O
outb(acpi_reset_val, addr);
break;
case 2: // PCI config space
pci_config_writeb(acpi_ga_to_bdf(addr), addr & 0xffff, acpi_reset_val);
break;
}
}
static void
acpi_set_reset_reg(struct acpi_20_generic_address *reg, u8 val)
{
if (!reg || reg->address_space_id > 2 ||
reg->register_bit_width != 8 || reg->register_bit_offset)
return;
acpi_reset_reg = *reg;
acpi_reset_val = val;
}
void
find_acpi_features(void)
{
struct fadt_descriptor_rev1 *fadt = find_fadt();
if (!fadt)
return;
u32 pm_tmr = le32_to_cpu(fadt->pm_tmr_blk);
u32 pm1a_cnt = le32_to_cpu(fadt->pm1a_cnt_blk);
dprintf(4, "pm_tmr_blk=%x\n", pm_tmr);
if (pm_tmr)
pmtimer_setup(pm_tmr);
if (pm1a_cnt)
acpi_pm1a_cnt = pm1a_cnt;
// Theoretically we should check the 'reset_reg_sup' flag, but Windows
// doesn't and thus nobody seems to *set* it. If the table is large enough
// to include it, let the sanity checks in acpi_set_reset_reg() suffice.
if (fadt->length >= 129) {
void *p = fadt;
acpi_set_reset_reg(p + 116, *(u8 *)(p + 128));
}
}
/****************************************************************
* SMBIOS
****************************************************************/
// Iterator for each sub-table in the smbios blob.
void *
smbios_next(struct smbios_entry_point *smbios, void *prev)
{
if (!smbios)
return NULL;
void *start = (void*)smbios->structure_table_address;
void *end = start + smbios->structure_table_length;
if (!prev) {
prev = start;
} else {
struct smbios_structure_header *hdr = prev;
if (prev + sizeof(*hdr) > end)
return NULL;
prev += hdr->length + 2;
while (prev < end && (*(u8*)(prev-1) != '\0' || *(u8*)(prev-2) != '\0'))
prev++;
}
struct smbios_structure_header *hdr = prev;
if (prev >= end || prev + sizeof(*hdr) >= end || prev + hdr->length >= end)
return NULL;
return prev;
}
struct smbios_entry_point *SMBiosAddr;
void
copy_smbios(void *pos)
{
if (SMBiosAddr)
return;
struct smbios_entry_point *p = pos;
if (p->signature != SMBIOS_SIGNATURE)
return;
if (checksum(pos, 0x10) != 0)
return;
if (memcmp(p->intermediate_anchor_string, "_DMI_", 5))
return;
if (checksum(pos+0x10, p->length-0x10) != 0)
return;
struct smbios_entry_point *newpos = malloc_fseg(p->length);
if (!newpos) {
warn_noalloc();
return;
}
dprintf(1, "Copying SMBIOS entry point from %p to %p\n", pos, newpos);
memcpy(newpos, pos, p->length);
SMBiosAddr = newpos;
}
void
display_uuid(void)
{
struct smbios_type_1 *tbl = smbios_next(SMBiosAddr, NULL);
int minlen = offsetof(struct smbios_type_1, uuid) + sizeof(tbl->uuid);
for (; tbl; tbl = smbios_next(SMBiosAddr, tbl))
if (tbl->header.type == 1 && tbl->header.length >= minlen) {
u8 *uuid = tbl->uuid;
u8 empty_uuid[sizeof(tbl->uuid)] = { 0 };
if (memcmp(uuid, empty_uuid, sizeof(empty_uuid)) == 0)
return;
printf("Machine UUID"
" %02x%02x%02x%02x"
"-%02x%02x"
"-%02x%02x"
"-%02x%02x"
"-%02x%02x%02x%02x%02x%02x\n"
, uuid[ 0], uuid[ 1], uuid[ 2], uuid[ 3]
, uuid[ 4], uuid[ 5]
, uuid[ 6], uuid[ 7]
, uuid[ 8], uuid[ 9]
, uuid[10], uuid[11], uuid[12], uuid[13], uuid[14], uuid[15]);
return;
}
}
#define set_str_field_or_skip(type, field, value) \
do { \
int size = (value != NULL) ? strlen(value) + 1 : 0; \
if (size > 1) { \
memcpy(end, value, size); \
end += size; \
p->field = ++str_index; \
} else { \
p->field = 0; \
} \
} while (0)
static void *
smbios_new_type_0(void *start,
const char *vendor, const char *version, const char *date)
{
struct smbios_type_0 *p = (struct smbios_type_0 *)start;
char *end = (char *)start + sizeof(struct smbios_type_0);
int str_index = 0;
p->header.type = 0;
p->header.length = sizeof(struct smbios_type_0);
p->header.handle = 0;
set_str_field_or_skip(0, vendor_str, vendor);
set_str_field_or_skip(0, bios_version_str, version);
p->bios_starting_address_segment = 0xe800;
set_str_field_or_skip(0, bios_release_date_str, date);
p->bios_rom_size = 0; /* FIXME */
/* BIOS characteristics not supported */
memset(p->bios_characteristics, 0, 8);
p->bios_characteristics[0] = 0x08;
/* Enable targeted content distribution (needed for SVVP) */
p->bios_characteristics_extension_bytes[0] = 0;
p->bios_characteristics_extension_bytes[1] = 4;
p->system_bios_major_release = 0;
p->system_bios_minor_release = 0;
p->embedded_controller_major_release = 0xFF;
p->embedded_controller_minor_release = 0xFF;
*end = 0;
end++;
if (!str_index) {
*end = 0;
end++;
}
return end;
}
#define BIOS_NAME "SeaBIOS"
#define BIOS_DATE "04/01/2014"
static int
smbios_romfile_setup(void)
{
struct romfile_s *f_anchor = romfile_find("etc/smbios/smbios-anchor");
struct romfile_s *f_tables = romfile_find("etc/smbios/smbios-tables");
struct smbios_entry_point ep;
struct smbios_type_0 *t0;
u16 qtables_len, need_t0 = 1;
u8 *qtables, *tables;
if (!f_anchor || !f_tables || f_anchor->size != sizeof(ep))
return 0;
f_anchor->copy(f_anchor, &ep, f_anchor->size);
if (f_tables->size != ep.structure_table_length)
return 0;
qtables = malloc_tmphigh(f_tables->size);
if (!qtables) {
warn_noalloc();
return 0;
}
f_tables->copy(f_tables, qtables, f_tables->size);
ep.structure_table_address = (u32)qtables; /* for smbios_next(), below */
/* did we get a type 0 structure ? */
for (t0 = smbios_next(&ep, NULL); t0; t0 = smbios_next(&ep, t0))
if (t0->header.type == 0) {
need_t0 = 0;
break;
}
qtables_len = ep.structure_table_length;
if (need_t0) {
/* common case: add our own type 0, with 3 strings and 4 '\0's */
u16 t0_len = sizeof(struct smbios_type_0) + strlen(BIOS_NAME) +
strlen(VERSION) + strlen(BIOS_DATE) + 4;
ep.structure_table_length += t0_len;
if (t0_len > ep.max_structure_size)
ep.max_structure_size = t0_len;
ep.number_of_structures++;
}
/* allocate final blob and record its address in the entry point */
if (ep.structure_table_length > BUILD_MAX_SMBIOS_FSEG)
tables = malloc_high(ep.structure_table_length);
else
tables = malloc_fseg(ep.structure_table_length);
if (!tables) {
warn_noalloc();
free(qtables);
return 0;
}
ep.structure_table_address = (u32)tables;
/* populate final blob */
if (need_t0)
tables = smbios_new_type_0(tables, BIOS_NAME, VERSION, BIOS_DATE);
memcpy(tables, qtables, qtables_len);
free(qtables);
/* finalize entry point */
ep.checksum -= checksum(&ep, 0x10);
ep.intermediate_checksum -= checksum((void *)&ep + 0x10, ep.length - 0x10);
copy_smbios(&ep);
return 1;
}
void
smbios_setup(void)
{
if (smbios_romfile_setup())
return;
smbios_legacy_setup();
}
void
copy_table(void *pos)
{
copy_pir(pos);
copy_mptable(pos);
copy_acpi_rsdp(pos);
copy_smbios(pos);
}