0011_read-additional-acpi-tables-from-a-vm.patch
4.49 KB
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Read additional ACPI tables from a VM (Gleb Natapov)
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/bios/rombios32.c b/bios/rombios32.c
index 27c5952..7be4216 100644
--- a/bios/rombios32.c
+++ b/bios/rombios32.c
@@ -469,6 +469,8 @@ void wrmsr_smp(uint32_t index, uint64_t val)
#define QEMU_CFG_SIGNATURE 0x00
#define QEMU_CFG_ID 0x01
#define QEMU_CFG_UUID 0x02
+#define QEMU_CFG_ARCH_LOCAL 0x8000
+#define QEMU_CFG_ACPI_TABLES (QEMU_CFG_ARCH_LOCAL + 0)
int qemu_cfg_port;
@@ -496,6 +498,27 @@ void qemu_cfg_read(uint8_t *buf, int len)
while (len--)
*(buf++) = inb(QEMU_CFG_DATA_PORT);
}
+
+static uint16_t acpi_additional_tables(void)
+{
+ uint16_t cnt;
+
+ qemu_cfg_select(QEMU_CFG_ACPI_TABLES);
+ qemu_cfg_read((uint8_t*)&cnt, sizeof(cnt));
+
+ return cnt;
+}
+
+static int acpi_load_table(int i, uint32_t addr, uint16_t *len)
+{
+ qemu_cfg_read((uint8_t*)len, sizeof(*len));
+
+ if (!*len)
+ return -1;
+
+ qemu_cfg_read((uint8_t*)addr, *len);
+ return 0;
+}
#endif
void uuid_probe(void)
@@ -1550,8 +1573,8 @@ void acpi_bios_init(void)
uint32_t hpet_addr;
#endif
uint32_t base_addr, rsdt_addr, fadt_addr, addr, facs_addr, dsdt_addr, ssdt_addr;
- uint32_t acpi_tables_size, madt_addr, madt_size;
- int i;
+ uint32_t acpi_tables_size, madt_addr, madt_size, rsdt_size;
+ uint16_t i, external_tables;
/* reserve memory space for tables */
#ifdef BX_USE_EBDA_TABLES
@@ -1564,10 +1587,17 @@ void acpi_bios_init(void)
bios_table_cur_addr += sizeof(*rsdp);
#endif
+#ifdef BX_QEMU
+ external_tables = acpi_additional_tables();
+#else
+ external_tables = 0;
+#endif
+
addr = base_addr = ram_size - ACPI_DATA_SIZE;
rsdt_addr = addr;
rsdt = (void *)(addr);
- addr += sizeof(*rsdt);
+ rsdt_size = sizeof(*rsdt) + external_tables * 4;
+ addr += rsdt_size;
fadt_addr = addr;
fadt = (void *)(addr);
@@ -1606,12 +1636,6 @@ void acpi_bios_init(void)
addr += sizeof(*hpet);
#endif
- acpi_tables_size = addr - base_addr;
-
- BX_INFO("ACPI tables: RSDP addr=0x%08lx ACPI DATA addr=0x%08lx size=0x%x\n",
- (unsigned long)rsdp,
- (unsigned long)rsdt, acpi_tables_size);
-
/* RSDP */
memset(rsdp, 0, sizeof(*rsdp));
memcpy(rsdp->signature, "RSD PTR ", 8);
@@ -1623,17 +1647,6 @@ void acpi_bios_init(void)
rsdp->rsdt_physical_address = cpu_to_le32(rsdt_addr);
rsdp->checksum = acpi_checksum((void *)rsdp, 20);
- /* RSDT */
- memset(rsdt, 0, sizeof(*rsdt));
- rsdt->table_offset_entry[0] = cpu_to_le32(fadt_addr);
- rsdt->table_offset_entry[1] = cpu_to_le32(madt_addr);
- rsdt->table_offset_entry[2] = cpu_to_le32(ssdt_addr);
-#ifdef BX_QEMU
- rsdt->table_offset_entry[3] = cpu_to_le32(hpet_addr);
-#endif
- acpi_build_table_header((struct acpi_table_header *)rsdt,
- "RSDT", sizeof(*rsdt), 1);
-
/* FADT */
memset(fadt, 0, sizeof(*fadt));
fadt->firmware_ctrl = cpu_to_le32(facs_addr);
@@ -1710,6 +1723,7 @@ void acpi_bios_init(void)
"APIC", madt_size, 1);
}
+ memset(rsdt, 0, rsdt_size);
#ifdef BX_QEMU
/* HPET */
memset(hpet, 0, sizeof(*hpet));
@@ -1720,7 +1734,34 @@ void acpi_bios_init(void)
hpet->addr.address = cpu_to_le32(ACPI_HPET_ADDRESS);
acpi_build_table_header((struct acpi_table_header *)hpet,
"HPET", sizeof(*hpet), 1);
+
+ acpi_additional_tables(); /* resets cfg to required entry */
+ for(i = 0; i < external_tables; i++) {
+ uint16_t len;
+ if(acpi_load_table(i, addr, &len) < 0)
+ BX_PANIC("Failed to load ACPI table from QEMU\n");
+ rsdt->table_offset_entry[i+4] = cpu_to_le32(addr);
+ addr += len;
+ if(addr >= ram_size)
+ BX_PANIC("ACPI table overflow\n");
+ }
+#endif
+
+ /* RSDT */
+ rsdt->table_offset_entry[0] = cpu_to_le32(fadt_addr);
+ rsdt->table_offset_entry[1] = cpu_to_le32(madt_addr);
+ rsdt->table_offset_entry[2] = cpu_to_le32(ssdt_addr);
+#ifdef BX_QEMU
+ rsdt->table_offset_entry[3] = cpu_to_le32(hpet_addr);
#endif
+ acpi_build_table_header((struct acpi_table_header *)rsdt,
+ "RSDT", rsdt_size, 1);
+
+ acpi_tables_size = addr - base_addr;
+
+ BX_INFO("ACPI tables: RSDP addr=0x%08lx ACPI DATA addr=0x%08lx size=0x%x\n",
+ (unsigned long)rsdp,
+ (unsigned long)rsdt, acpi_tables_size);
}