This adds a cbmem_toc_ptr_t structure, which is written just below the FADT, so we can find it using the FADP information. The actual writing is only implemented for the Intel 82371EB southbridge.
Also adds code to acpi.c resume codepath to use this pointer when the chipset has not overridden the weak get_cbmem_toc() function.
Effectively the latter part affects all boards that already implement ACPI S2 or S3 resume, but shouldn't change behaviour since none of them generate the structure:
asus/m2v asus/m4a785-m asus/m2v-mx_se gigabyte/ma78gm gigabyte/ma785gmt jetway/pa78vm5 iwill/dk8_htx asrock/939a785gmh amd/dbm690t amd/mahogany amd/tilapia_fam10 amd/pistachio amd/serengeti_cheetah_fam10 amd/serengeti_cheetah amd/mahogany_fam10 kontron/kt690 iei/kino-780am2-fam10 technexion/tim5690 technexion/tim8690
BTW, via/epia-m700 defines HAVE_ACPI_TABLES, but does not supply a dsdt.asl (only a get_dsdt script)
Signed-off-by: Tobias Diedrich ranma+coreboot@tdiedrich.de
---
Index: src/arch/i386/boot/acpi.c =================================================================== --- src/arch/i386/boot/acpi.c.orig 2010-12-01 19:11:35.000000000 +0100 +++ src/arch/i386/boot/acpi.c 2010-12-01 19:11:36.000000000 +0100 @@ -517,6 +517,7 @@ acpi_rsdt_t *rsdt; acpi_facs_t *facs; acpi_fadt_t *fadt; + cbmem_toc_ptr_t *cbmem_tocp; void *wake_vec; int i;
@@ -537,11 +538,22 @@ return NULL;
printk(BIOS_DEBUG, "RSDP found at %p\n", rsdp); + cbmem_tocp = (cbmem_toc_ptr_t *)(rsdp->rsdt_address - sizeof(cbmem_toc_ptr_t)); rsdt = (acpi_rsdt_t *) rsdp->rsdt_address;
end = (char *)rsdt + rsdt->header.length; printk(BIOS_DEBUG, "RSDT found at %p ends at %p\n", rsdt, end);
+ if (get_cbmem_toc() == 0) { /* Only use cbmem_tocp if there is no chipset override */ + if (cbmem_tocp->sig != CBMEM_TOC_PTR_SIG) { + printk(BIOS_DEBUG, "cbmem toc pointer not found at %p (sig %08x sz %d)\n", cbmem_tocp, cbmem_tocp->sig, sizeof(cbmem_toc_ptr_t)); + return NULL; + } + set_cbmem_toc(cbmem_tocp->ptr); + } else { + printk(BIOS_DEBUG, "cbmem toc is at %p\n", get_cbmem_toc()); + } + for (i = 0; ((char *)&rsdt->entry[i]) < end; i++) { fadt = (acpi_fadt_t *)rsdt->entry[i]; if (strncmp((char *)fadt, "FACP", 4) == 0) Index: src/southbridge/intel/i82371eb/acpi_tables.c =================================================================== --- src/southbridge/intel/i82371eb/acpi_tables.c.orig 2010-12-01 19:11:35.000000000 +0100 +++ src/southbridge/intel/i82371eb/acpi_tables.c 2010-12-01 19:11:36.000000000 +0100 @@ -26,6 +26,7 @@ #include <arch/smp/mpspec.h> #include <device/device.h> #include <device/pci_ids.h> +#include <cbmem.h> #include "i82371eb.h"
extern const unsigned char AmlCode[]; @@ -104,6 +105,7 @@ unsigned long __attribute__((weak)) write_acpi_tables(unsigned long start) { unsigned long current; + cbmem_toc_ptr_t *cbmem_tocp; acpi_rsdp_t *rsdp; acpi_rsdt_t *rsdt; acpi_fadt_t *fadt; @@ -113,20 +115,28 @@ acpi_header_t *dsdt;
/* Align ACPI tables to 16 byte. */ - start = (start + 0x0f) & -0x10; - current = start; + current = ALIGN(start, 16);
printk(BIOS_INFO, "ACPI: Writing ACPI tables at %lx...\n", start);
/* We need at least an RSDP and an RSDT table. */ rsdp = (acpi_rsdp_t *) current; current += sizeof(acpi_rsdp_t); + + /* put cbmem toc ptr structure directly below rsdt */ + printk(BIOS_INFO, "ACPI: Writing cbmem_toc pointer at %lx...\n", current); + cbmem_tocp = (cbmem_toc_ptr_t *) current; + current += sizeof(cbmem_toc_ptr_t); + rsdt = (acpi_rsdt_t *) current; current += sizeof(acpi_rsdt_t);
/* Clear all table memory. */ memset((void *) start, 0, current - start);
+ cbmem_tocp->sig = CBMEM_TOC_PTR_SIG; + cbmem_tocp->ptr = get_cbmem_toc(); + acpi_write_rsdp(rsdp, rsdt, NULL); acpi_write_rsdt(rsdt);
Index: src/include/cbmem.h =================================================================== --- src/include/cbmem.h.orig 2010-12-01 19:11:35.000000000 +0100 +++ src/include/cbmem.h 2010-12-01 19:11:36.000000000 +0100 @@ -39,6 +39,13 @@ #define CBMEM_ID_RESUME 0x5245534d #define CBMEM_ID_NONE 0x00000000
+#define CBMEM_TOC_PTR_SIG 0x43425443 + +typedef struct cbmem_toc_ptr { + u32 sig; + void *ptr; +} __attribute__((packed)) cbmem_toc_ptr_t; + void cbmem_initialize(void);
void cbmem_init(u64 baseaddr, u64 size); Index: src/lib/cbmem.c =================================================================== --- src/lib/cbmem.c.orig 2010-12-01 19:11:35.000000000 +0100 +++ src/lib/cbmem.c 2010-12-01 19:11:36.000000000 +0100 @@ -52,6 +52,9 @@
static struct cbmem_entry *bss_cbmem_toc;
+/* chipset can override get/set_cbmem_toc to store the cbmem_toc address + * in nvram if available */ + struct cbmem_entry *__attribute__((weak)) get_cbmem_toc(void) { return bss_cbmem_toc; @@ -59,7 +62,7 @@
void __attribute__((weak)) set_cbmem_toc(struct cbmem_entry * x) { - /* do nothing, this should be called by chipset to save TOC in NVRAM */ + bss_cbmem_toc = x; }
#endif