[PATCH] x86: coreboot: add SMBIOS cbmem entry parsing

[Christian Gmeiner]

Signed-off-by: Christian Gmeiner <christian.gmei...@gmail.com>
---
 arch/x86/cpu/coreboot/tables.c               | 14 ++++++++++++++
 arch/x86/include/asm/arch-coreboot/sysinfo.h |  2 ++
 arch/x86/include/asm/coreboot_tables.h       | 11 +++++++++++
 3 files changed, 27 insertions(+)

diff --git a/arch/x86/cpu/coreboot/tables.c b/arch/x86/cpu/coreboot/tables.c
index 0f04c4f8e9..a5d31d1dea 100644
--- a/arch/x86/cpu/coreboot/tables.c
+++ b/arch/x86/cpu/coreboot/tables.c
@@ -69,6 +69,17 @@ static void cb_parse_vbnv(unsigned char *ptr, struct 
sysinfo_t *info)
        info->vbnv_size = vbnv->vbnv_size;
 }
 
+static void cb_parse_cbmem_entry(unsigned char *ptr, struct sysinfo_t *info)
+{
+       struct cb_cbmem_entry *entry = (struct cb_cbmem_entry *)ptr;
+
+       if (entry->id != CBMEM_ID_SMBIOS)
+               return;
+
+       info->smbios_start = entry->address;
+       info->smbios_size = entry->entry_size;
+}
+
 static void cb_parse_gpios(unsigned char *ptr, struct sysinfo_t *info)
 {
        int i;
@@ -206,6 +217,9 @@ static int cb_parse_header(void *addr, int len, struct 
sysinfo_t *info)
                case CB_TAG_VBNV:
                        cb_parse_vbnv(ptr, info);
                        break;
+               case CB_TAG_CBMEM_ENTRY:
+                       cb_parse_cbmem_entry(ptr, info);
+                       break;
                default:
                        cb_parse_unhandled(rec->tag, ptr);
                        break;
diff --git a/arch/x86/include/asm/arch-coreboot/sysinfo.h 
b/arch/x86/include/asm/arch-coreboot/sysinfo.h
index dd8d1cba92..419ec52933 100644
--- a/arch/x86/include/asm/arch-coreboot/sysinfo.h
+++ b/arch/x86/include/asm/arch-coreboot/sysinfo.h
@@ -49,6 +49,8 @@ struct sysinfo_t {
        u32     vdat_size;
        void    *tstamp_table;
        void    *cbmem_cons;
+       u64 smbios_start;
+       u32 smbios_size;
 
        struct cb_serial *serial;
 };
diff --git a/arch/x86/include/asm/coreboot_tables.h 
b/arch/x86/include/asm/coreboot_tables.h
index 268284f43c..7e1576768b 100644
--- a/arch/x86/include/asm/coreboot_tables.h
+++ b/arch/x86/include/asm/coreboot_tables.h
@@ -214,6 +214,17 @@ struct cb_vbnv {
        uint32_t vbnv_size;
 };
 
+#define CB_TAG_CBMEM_ENTRY 0x0031
+#define CBMEM_ID_SMBIOS    0x534d4254
+
+struct cb_cbmem_entry {
+       uint32_t tag;
+       uint32_t size;
+       uint64_t address;
+       uint32_t entry_size;
+       uint32_t id;
+};
+
 #define CB_TAG_CMOS_OPTION_TABLE       0x00c8
 
 struct cb_cmos_option_table {
-- 
2.25.1