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If the revision is 0, don't trust the length in the RSDP. Instead assume

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an ACPI version 1.0 length.
This commit is contained in:
Nate Lawson 2004-05-16 18:02:47 +00:00
parent be69fbd7aa
commit 07c8b2af05
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=129278
1 changed files with 7 additions and 2 deletions
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9
usr.sbin/acpi/acpidump/acpi_user.c
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@ -96,6 +96,7 @@ static struct ACPIrsdp *
acpi_get_rsdp(u_long addr)
{
struct ACPIrsdp rsdp;
size_t len;
/* Read in the table signature and check it. */
pread(acpi_mem_fd, &rsdp, 8, addr);
@ -108,12 +109,16 @@ acpi_get_rsdp(u_long addr)
/* Run the checksum only over the version 1 header. */
if (acpi_checksum(&rsdp, 20))
return (NULL);
/* If the revision is 0, assume a version 1 length. */
if (rsdp.revision == 0)
return (NULL);
len = 20;
else
len = rsdp.length;
/* XXX Should handle ACPI 2.0 RSDP extended checksum here. */
return (acpi_map_physical(addr, rsdp.length));
return (acpi_map_physical(addr, len));
}
/*