[SeaBIOS] [PATCH 2/2] seabios: acpi: allow qemu to load dsdt as external acpi table.
Isaku Yamahata
yamahata at valinux.co.jp
Mon Oct 24 10:11:08 CEST 2011
allow qemu to load dsdt as external acpi table.
Signed-off-by: Isaku Yamahata <yamahata at valinux.co.jp>
---
changes v2 -> v3.
- typo.
- check if fadt->dsdt is NULL.
dsdt might be passed from qemu many times. Check it.
changes v1 -> v2.
- load qemu table first and they try default dsdt table if
qemu doesn't supply dsdt.
Thus unnecessary malloc_high()/free() is avoided.
---
src/acpi.c | 47 +++++++++++++++++++++++++++++++++++++++--------
1 files changed, 39 insertions(+), 8 deletions(-)
diff --git a/src/acpi.c b/src/acpi.c
index 27a939e..8d8618e 100644
--- a/src/acpi.c
+++ b/src/acpi.c
@@ -53,6 +53,11 @@ struct facs_descriptor_rev1
/*
+ * Differentiated System Description Table (DSDT)
+ */
+#define DSDT_SIGNATURE 0x54445344 // DSDT
+
+/*
* MADT values and structures
*/
@@ -236,14 +241,23 @@ static const struct pci_device_id fadt_init_tbl[] = {
PCI_DEVICE_END
};
+static void fill_dsdt(struct fadt_descriptor_rev1 *fadt, void *dsdt)
+{
+ if (fadt->dsdt) {
+ free((void *)le32_to_cpu(fadt->dsdt));
+ }
+ fadt->dsdt = cpu_to_le32((u32)dsdt);
+ fadt->checksum -= checksum(fadt, sizeof(*fadt));
+ dprintf(1, "ACPI DSDT=%p\n", dsdt);
+}
+
static void *
build_fadt(struct pci_device *pci)
{
struct fadt_descriptor_rev1 *fadt = malloc_high(sizeof(*fadt));
struct facs_descriptor_rev1 *facs = memalign_high(64, sizeof(*facs));
- void *dsdt = malloc_high(sizeof(AmlCode));
- if (!fadt || !facs || !dsdt) {
+ if (!fadt || !facs) {
warn_noalloc();
return NULL;
}
@@ -253,13 +267,11 @@ build_fadt(struct pci_device *pci)
facs->signature = FACS_SIGNATURE;
facs->length = cpu_to_le32(sizeof(*facs));
- /* DSDT */
- memcpy(dsdt, AmlCode, sizeof(AmlCode));
-
/* FADT */
memset(fadt, 0, sizeof(*fadt));
fadt->firmware_ctrl = cpu_to_le32((u32)facs);
- fadt->dsdt = cpu_to_le32((u32)dsdt);
+ fadt->dsdt = 0; /* dsdt will be filled later in acpi_bios_init()
+ by fill_dsdt() */
fadt->model = 1;
fadt->reserved1 = 0;
int pm_sci_int = pci_config_readb(pci->bdf, PCI_INTERRUPT_LINE);
@@ -630,7 +642,8 @@ acpi_bios_init(void)
tbl_idx++; \
} while(0)
- ACPI_INIT_TABLE(build_fadt(pci));
+ struct fadt_descriptor_rev1 *fadt = build_fadt(pci);
+ ACPI_INIT_TABLE(fadt);
ACPI_INIT_TABLE(build_ssdt());
ACPI_INIT_TABLE(build_madt());
ACPI_INIT_TABLE(build_hpet());
@@ -645,12 +658,30 @@ acpi_bios_init(void)
warn_noalloc();
continue;
}
- ACPI_INIT_TABLE(qemu_cfg_next_acpi_table_load(addr, len));
+ struct acpi_table_header *header =
+ qemu_cfg_next_acpi_table_load(addr, len);
+ if (header->signature == DSDT_SIGNATURE) {
+ if (fadt) {
+ fill_dsdt(fadt, addr);
+ }
+ } else {
+ ACPI_INIT_TABLE(header);
+ }
if (tbl_idx == MAX_ACPI_TABLES) {
warn_noalloc();
break;
}
}
+ if (fadt && !fadt->dsdt) {
+ /* default DSDT */
+ void *dsdt = malloc_high(sizeof(AmlCode));
+ if (!dsdt) {
+ warn_noalloc();
+ return;
+ }
+ memcpy(dsdt, AmlCode, sizeof(AmlCode));
+ fill_dsdt(fadt, dsdt);
+ }
// Build final rsdt table
struct rsdt_descriptor_rev1 *rsdt;
--
1.7.1.1
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