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Read max_cpus variable from QEMU_CFG. If not provided, use value of
smp_cpus.
Signed-off-by: Jes Sorensen <jes@sgi.com>
diff --git a/bios/rombios.h b/bios/rombios.h
index 8ece2ee..dbf3bd3 100644
--- a/bios/rombios.h
+++ b/bios/rombios.h
@@ -65,6 +65,7 @@
#define QEMU_CFG_UUID 0x02
#define QEMU_CFG_NUMA 0x0d
#define QEMU_CFG_BOOT_MENU 0x0e
+#define QEMU_CFG_MAX_CPUS 0x0f
#define QEMU_CFG_ARCH_LOCAL 0x8000
#define QEMU_CFG_ACPI_TABLES (QEMU_CFG_ARCH_LOCAL + 0)
#define QEMU_CFG_SMBIOS_ENTRIES (QEMU_CFG_ARCH_LOCAL + 1)
diff --git a/bios/rombios32.c b/bios/rombios32.c
index 69e82b1..610fc1f 100644
--- a/bios/rombios32.c
+++ b/bios/rombios32.c
@@ -436,6 +436,7 @@ void delay_ms(int n)
}
uint16_t smp_cpus;
+uint16_t max_cpus;
uint32_t cpuid_signature;
uint32_t cpuid_features;
uint32_t cpuid_ext_features;
@@ -526,6 +527,19 @@ static uint16_t smbios_entries(void)
return cnt;
}
+static uint16_t get_max_cpus(void)
+{
+ uint16_t cnt;
+
+ qemu_cfg_select(QEMU_CFG_MAX_CPUS);
+ qemu_cfg_read((uint8_t*)&cnt, sizeof(cnt));
+
+ if (!cnt)
+ cnt = smp_cpus;
+
+ return cnt;
+}
+
uint64_t qemu_cfg_get64 (void)
{
uint64_t ret;
@@ -2689,6 +2703,12 @@ void rombios32_init(uint32_t *s3_resume_vector, uint8_t *shutdown_flag)
smp_probe();
+#ifdef BX_QEMU
+ max_cpus = get_max_cpus();
+#else
+ max_cpus = smp_cpus;
+#endif
+
find_bios_table_area();
if (*shutdown_flag == 0xfe) {
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