minix/kernel/arch/i386/acpi.c

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#include <string.h>
#include "kernel/kernel.h"
#include "acpi.h"
#include "arch_proto.h"
typedef int ((* acpi_read_t)(phys_bytes addr, void * buff, size_t size));
struct acpi_rsdp acpi_rsdp;
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static acpi_read_t read_func;
#define MAX_RSDT 35 /* ACPI defines 35 signatures */
#define SLP_EN_CODE (1 << 13) /* ACPI SLP_EN_CODE code */
#define AMI_PACKAGE_OP_CODE (0x12)
#define AMI_NAME_OP_CODE (0x8)
#define AMI_BYTE_PREFIX_CODE (0xA)
#define AMI_PACKAGE_LENGTH_ENCODING_BITS_MASK (0xC0)
#define AMI_PACKAGE_LENGTH_ENCODING_BITS_SHIFT (6)
#define AMI_MIN_PACKAGE_LENGTH (1)
#define AMI_NUM_ELEMENTS_LENGTH (1)
#define AMI_SLP_TYPA_SHIFT (10)
#define AMI_SLP_TYPB_SHIFT (10)
#define AMI_S5_NAME_OP_OFFSET_1 (-1)
#define AMI_S5_NAME_OP_OFFSET_2 (-2)
#define AMI_S5_PACKAGE_OP_OFFSET (4)
#define AMI_S5_PACKET_LENGTH_OFFSET (5)
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static struct acpi_rsdt {
struct acpi_sdt_header hdr;
u32_t data[MAX_RSDT];
} rsdt;
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static struct {
char signature [ACPI_SDT_SIGNATURE_LEN + 1];
size_t length;
} sdt_trans[MAX_RSDT];
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static int sdt_count;
static u16_t pm1a_cnt_blk = 0;
static u16_t pm1b_cnt_blk = 0;
static u16_t slp_typa = 0;
static u16_t slp_typb = 0;
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static int acpi_check_csum(struct acpi_sdt_header * tb, size_t size)
{
u8_t total = 0;
int i;
for (i = 0; i < size; i++)
total += ((unsigned char *)tb)[i];
return total == 0 ? 0 : -1;
}
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static int acpi_check_signature(const char * orig, const char * match)
{
return strncmp(orig, match, ACPI_SDT_SIGNATURE_LEN);
}
static u32_t acpi_phys2vir(u32_t p)
{
if(!vm_running) {
printf("acpi: returning 0x%lx as vir addr\n", p);
return p;
}
panic("acpi: can't get virtual address of arbitrary physical address");
}
static int acpi_phys_copy(phys_bytes phys, void *target, size_t len)
{
if(!vm_running) {
memcpy(target, (void *) phys, len);
return 0;
}
panic("can't acpi_phys_copy with vm");
}
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static int acpi_read_sdt_at(phys_bytes addr,
struct acpi_sdt_header * tb,
size_t size,
const char * name)
{
struct acpi_sdt_header hdr;
/* if NULL is supplied, we only return the size of the table */
if (tb == NULL) {
if (read_func(addr, &hdr, sizeof(struct acpi_sdt_header))) {
printf("ERROR acpi cannot read %s header\n", name);
return -1;
}
return hdr.length;
}
if (read_func(addr, tb, sizeof(struct acpi_sdt_header))) {
printf("ERROR acpi cannot read %s header\n", name);
return -1;
}
if (acpi_check_signature(tb->signature, name)) {
printf("ERROR acpi %s signature does not match\n", name);
return -1;
}
if (size < tb->length) {
printf("ERROR acpi buffer too small for %s\n", name);
return -1;
}
if (read_func(addr, tb, size)) {
printf("ERROR acpi cannot read %s\n", name);
return -1;
}
if (acpi_check_csum(tb, tb->length)) {
printf("ERROR acpi %s checksum does not match\n", name);
return -1;
}
return tb->length;
}
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phys_bytes acpi_get_table_base(const char * name)
{
int i;
for(i = 0; i < sdt_count; i++) {
if (strncmp(name, sdt_trans[i].signature,
ACPI_SDT_SIGNATURE_LEN) == 0)
return (phys_bytes) rsdt.data[i];
}
return (phys_bytes) NULL;
}
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size_t acpi_get_table_length(const char * name)
{
int i;
for(i = 0; i < sdt_count; i++) {
if (strncmp(name, sdt_trans[i].signature,
ACPI_SDT_SIGNATURE_LEN) == 0)
return sdt_trans[i].length;
}
return 0;
}
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static void * acpi_madt_get_typed_item(struct acpi_madt_hdr * hdr,
unsigned char type,
unsigned idx)
{
u8_t * t, * end;
int i;
t = (u8_t *) hdr + sizeof(struct acpi_madt_hdr);
end = (u8_t *) hdr + hdr->hdr.length;
i = 0;
while(t < end) {
if (type == ((struct acpi_madt_item_hdr *) t)->type) {
if (i == idx)
return t;
else
i++;
}
t += ((struct acpi_madt_item_hdr *) t)->length;
}
return NULL;
}
#if 0
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static void * acpi_madt_get_item(struct acpi_madt_hdr * hdr,
unsigned idx)
{
u8_t * t, * end;
int i;
t = (u8_t *) hdr + sizeof(struct acpi_madt_hdr);
end = (u8_t *) hdr + hdr->hdr.length;
for(i = 0 ; i <= idx && t < end; i++) {
if (i == idx)
return t;
t += ((struct acpi_madt_item_hdr *) t)->length;
}
return NULL;
}
#endif
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static int acpi_rsdp_test(void * buff)
{
struct acpi_rsdp * rsdp = (struct acpi_rsdp *) buff;
if (!platform_tbl_checksum_ok(buff, 20))
return 0;
if (strncmp(rsdp->signature, "RSD PTR ", 8))
return 0;
return 1;
}
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static int get_acpi_rsdp(void)
{
u16_t ebda;
/*
* Read 40:0Eh - to find the starting address of the EBDA.
*/
acpi_phys_copy (0x40E, &ebda, sizeof(ebda));
if (ebda) {
ebda <<= 4;
if(platform_tbl_ptr(ebda, ebda + 0x400, 16, &acpi_rsdp,
sizeof(acpi_rsdp), &machine.acpi_rsdp,
acpi_rsdp_test))
return 1;
}
/* try BIOS read only mem space */
if(platform_tbl_ptr(0xE0000, 0x100000, 16, &acpi_rsdp,
sizeof(acpi_rsdp), &machine.acpi_rsdp,
acpi_rsdp_test))
return 1;
machine.acpi_rsdp = 0; /* RSDP cannot be found at this address therefore
it is a valid negative value */
return 0;
}
static void acpi_init_poweroff(void)
{
u8_t *ptr = NULL;
u8_t *start = NULL;
u8_t *end = NULL;
struct acpi_fadt_header *fadt_header = NULL;
struct acpi_rsdt * dsdt_header = NULL;
char *msg = NULL;
/* Everything used here existed since ACPI spec 1.0 */
/* So we can safely use them */
fadt_header = (struct acpi_fadt_header *)
acpi_phys2vir(acpi_get_table_base("FACP"));
if (fadt_header == NULL) {
msg = "Could not load FACP";
goto exit;
}
dsdt_header = (struct acpi_rsdt *)
acpi_phys2vir((phys_bytes) fadt_header->dsdt);
if (dsdt_header == NULL) {
msg = "Could not load DSDT";
goto exit;
}
pm1a_cnt_blk = fadt_header->pm1a_cnt_blk;
pm1b_cnt_blk = fadt_header->pm1b_cnt_blk;
ptr = start = (u8_t *) dsdt_header->data;
end = start + dsdt_header->hdr.length - 4;
/* See http://forum.osdev.org/viewtopic.php?t=16990 */
/* for layout of \_S5 */
while (ptr < end && memcmp(ptr, "_S5_", 4) != 0)
ptr++;
msg = "Could not read S5 data. Use default SLP_TYPa and SLP_TYPb";
if (ptr >= end || ptr == start)
goto exit;
/* validate AML structure */
if (*(ptr + AMI_S5_PACKAGE_OP_OFFSET) != AMI_PACKAGE_OP_CODE)
goto exit;
if ((ptr < start + (-AMI_S5_NAME_OP_OFFSET_2) ||
(*(ptr + AMI_S5_NAME_OP_OFFSET_2) != AMI_NAME_OP_CODE ||
*(ptr + AMI_S5_NAME_OP_OFFSET_2 + 1) != '\\')) &&
*(ptr + AMI_S5_NAME_OP_OFFSET_1) != AMI_NAME_OP_CODE)
goto exit;
ptr += AMI_S5_PACKET_LENGTH_OFFSET;
if (ptr >= end)
goto exit;
/* package length */
ptr += ((*ptr & AMI_PACKAGE_LENGTH_ENCODING_BITS_MASK) >>
AMI_PACKAGE_LENGTH_ENCODING_BITS_SHIFT) +
AMI_MIN_PACKAGE_LENGTH + AMI_NUM_ELEMENTS_LENGTH;
if (ptr >= end)
goto exit;
if (*ptr == AMI_BYTE_PREFIX_CODE)
ptr++; /* skip byte prefix */
slp_typa = (*ptr) << AMI_SLP_TYPA_SHIFT;
ptr++; /* move to SLP_TYPb */
if (*ptr == AMI_BYTE_PREFIX_CODE)
ptr++; /* skip byte prefix */
slp_typb = (*ptr) << AMI_SLP_TYPB_SHIFT;
msg = "poweroff initialized";
exit:
if (msg) {
printf("acpi: %s\n", msg);
}
}
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void acpi_init(void)
{
int s, i;
read_func = acpi_phys_copy;
if (!get_acpi_rsdp()) {
printf("WARNING : Cannot configure ACPI\n");
return;
}
s = acpi_read_sdt_at(acpi_rsdp.rsdt_addr, (struct acpi_sdt_header *) &rsdt,
sizeof(struct acpi_rsdt), ACPI_SDT_SIGNATURE(RSDT));
sdt_count = (s - sizeof(struct acpi_sdt_header)) / sizeof(u32_t);
for (i = 0; i < sdt_count; i++) {
struct acpi_sdt_header hdr;
int j;
if (read_func(rsdt.data[i], &hdr, sizeof(struct acpi_sdt_header))) {
printf("ERROR acpi cannot read header at 0x%x\n",
rsdt.data[i]);
return;
}
for (j = 0 ; j < ACPI_SDT_SIGNATURE_LEN; j++)
sdt_trans[i].signature[j] = hdr.signature[j];
sdt_trans[i].signature[ACPI_SDT_SIGNATURE_LEN] = '\0';
sdt_trans[i].length = hdr.length;
}
acpi_init_poweroff();
}
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struct acpi_madt_ioapic * acpi_get_ioapic_next(void)
{
static unsigned idx = 0;
static struct acpi_madt_hdr * madt_hdr;
struct acpi_madt_ioapic * ret;
if (idx == 0) {
madt_hdr = (struct acpi_madt_hdr *)
acpi_phys2vir(acpi_get_table_base("APIC"));
if (madt_hdr == NULL)
return NULL;
}
ret = (struct acpi_madt_ioapic *)
acpi_madt_get_typed_item(madt_hdr, ACPI_MADT_TYPE_IOAPIC, idx);
if (ret)
idx++;
return ret;
}
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struct acpi_madt_lapic * acpi_get_lapic_next(void)
{
static unsigned idx = 0;
static struct acpi_madt_hdr * madt_hdr;
struct acpi_madt_lapic * ret;
if (idx == 0) {
madt_hdr = (struct acpi_madt_hdr *)
acpi_phys2vir(acpi_get_table_base("APIC"));
if (madt_hdr == NULL)
return NULL;
}
for (;;) {
ret = (struct acpi_madt_lapic *)
acpi_madt_get_typed_item(madt_hdr,
ACPI_MADT_TYPE_LAPIC, idx);
if (!ret)
break;
idx++;
/* report only usable CPUs */
if (ret->flags & 1)
break;
}
return ret;
}
void __k_unpaged_acpi_poweroff(void)
{
/* NO OP poweroff symbol*/
}
void acpi_poweroff(void)
{
if (pm1a_cnt_blk == 0) {
return;
}
outw(pm1a_cnt_blk, slp_typa | SLP_EN_CODE);
if (pm1b_cnt_blk != 0) {
outw(pm1b_cnt_blk, slp_typb | SLP_EN_CODE);
}
}