Hi Jan,
Not a comment on the patch changes directly but on the code covered by
the patch: in my experience on some EFI bioses you can't assume that the
SMBIOS tables are in a region beginning 0xF0000. The location needs to
be retrieved from the EFI system table, but I guess you have this in hand.
Chris
On 21/06/11 09:01, Jan Beulich wrote:
Besides being (in my eyes) desirable cleanup, this at once represents
another prerequisite for native EFI booting support.
Signed-off-by: Jan Beulich<jbeulich@xxxxxxxxxx>
--- a/xen/arch/x86/dmi_scan.c
+++ b/xen/arch/x86/dmi_scan.c
@@ -10,11 +10,31 @@
#include<asm/system.h>
#include<xen/dmi.h>
-#define bt_ioremap(b,l) ((u8 *)__acpi_map_table(b,l))
+#define bt_ioremap(b,l) ((void *)__acpi_map_table(b,l))
#define bt_iounmap(b,l) ((void)0)
#define memcpy_fromio memcpy
#define alloc_bootmem(l) xmalloc_bytes(l)
+struct dmi_eps {
+ char anchor[5]; /* "_DMI_" */
+ u8 checksum;
+ u16 size;
+ u32 address;
+ u16 num_structures;
+ u8 revision;
+} __attribute__((packed));
+
+struct smbios_eps {
+ char anchor[4]; /* "_SM_" */
+ u8 checksum;
+ u8 length;
+ u8 major, minor;
+ u16 max_size;
+ u8 revision;
+ u8 _rsrvd_[5];
+ struct dmi_eps dmi;
+} __attribute__((packed));
+
struct dmi_header
{
u8 type;
@@ -90,62 +110,70 @@ static int __init dmi_table(u32 base, in
}
-inline static int __init dmi_checksum(u8 *buf)
+static inline bool_t __init dmi_checksum(const void __iomem *buf,
+ unsigned int len)
{
- u8 sum=0;
- int a;
+ u8 sum = 0;
+ const u8 *p = buf;
+ unsigned int a;
- for(a=0; a<15; a++)
- sum+=buf[a];
- return (sum==0);
+ for (a = 0; a< len; a++)
+ sum += p[a];
+ return sum == 0;
}
int __init dmi_get_table(u32 *base, u32 *len)
{
- u8 buf[15];
+ struct dmi_eps eps;
char __iomem *p, *q;
p = maddr_to_virt(0xF0000);
for (q = p; q< p + 0x10000; q += 16) {
- memcpy_fromio(buf, q, 15);
- if (memcmp(buf, "_DMI_", 5)==0&& dmi_checksum(buf)) {
- *base=buf[11]<<24|buf[10]<<16|buf[9]<<8|buf[8];
- *len=buf[7]<<8|buf[6];
+ memcpy_fromio(&eps, q, 15);
+ if (memcmp(eps.anchor, "_DMI_", 5) == 0&&
+ dmi_checksum(&eps, sizeof(eps))) {
+ *base = eps.address;
+ *len = eps.size;
return 0;
}
}
return -1;
}
+static int __init _dmi_iterate(const struct dmi_eps *dmi,
+ const struct smbios_eps __iomem *smbios,
+ void (*decode)(struct dmi_header *))
+{
+ u16 num = dmi->num_structures;
+ u16 len = dmi->size;
+ u32 base = dmi->address;
+
+ /*
+ * DMI version 0.0 means that the real version is taken from
+ * the SMBIOS version, which we may not know at this point.
+ */
+ if (dmi->revision)
+ printk(KERN_INFO "DMI %d.%d present.\n",
+ dmi->revision>> 4, dmi->revision& 0x0f);
+ else if (!smbios)
+ printk(KERN_INFO "DMI present.\n");
+ dmi_printk((KERN_INFO "%d structures occupying %d bytes.\n",
+ num, len));
+ dmi_printk((KERN_INFO "DMI table at 0x%08X.\n", base));
+ return dmi_table(base, len, num, decode);
+}
+
static int __init dmi_iterate(void (*decode)(struct dmi_header *))
{
- u8 buf[15];
+ struct dmi_eps eps;
char __iomem *p, *q;
p = maddr_to_virt(0xF0000);
for (q = p; q< p + 0x10000; q += 16) {
- memcpy_fromio(buf, q, 15);
- if (memcmp(buf, "_DMI_", 5)==0&& dmi_checksum(buf)) {
- u16 num=buf[13]<<8|buf[12];
- u16 len=buf[7]<<8|buf[6];
- u32 base=buf[11]<<24|buf[10]<<16|buf[9]<<8|buf[8];
-
- /*
- * DMI version 0.0 means that the real version is taken
from
- * the SMBIOS version, which we don't know at this
point.
- */
- if(buf[14]!=0)
- printk(KERN_INFO "DMI %d.%d present.\n",
- buf[14]>>4, buf[14]&0x0F);
- else
- printk(KERN_INFO "DMI present.\n");
- dmi_printk((KERN_INFO "%d structures occupying %d
bytes.\n",
- num, len));
- dmi_printk((KERN_INFO "DMI table at 0x%08X.\n",
- base));
- if(dmi_table(base,len, num, decode)==0)
- return 0;
- }
+ memcpy_fromio(&eps, q, sizeof(eps));
+ if (memcmp(eps.anchor, "_DMI_", 5) == 0&&
+ dmi_checksum(&eps, sizeof(eps)))
+ return _dmi_iterate(&eps, NULL, decode);
}
return -1;
}
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