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Read in the entire RSDP but only run the standard checksum over the

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version 1 header.  Add comments to explain what we're doing here better.

Reported by:	Alex Vasylenko <lxv@omut.org>
This commit is contained in:
Nate Lawson 2004-05-16 05:31:40 +00:00
parent 9049715ff9
commit 2ff84d1485
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=129272
1 changed files with 12 additions and 7 deletions
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19
usr.sbin/acpi/acpidump/acpi_user.c
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@ -96,19 +96,24 @@ static struct ACPIrsdp *
acpi_get_rsdp(u_long addr) acpi_get_rsdp(u_long addr)
{ {
struct ACPIrsdp rsdp; struct ACPIrsdp rsdp;
size_t len;
/* Read in the table signature and check it. */
pread(acpi_mem_fd, &rsdp, 8, addr); pread(acpi_mem_fd, &rsdp, 8, addr);
if (memcmp(rsdp.signature, "RSD PTR ", 8)) if (memcmp(rsdp.signature, "RSD PTR ", 8))
return (NULL); return (NULL);
/* Read the entire table. */ /* Read the entire table. */
len = sizeof(rsdp); pread(acpi_mem_fd, &rsdp, sizeof(rsdp), addr);
pread(acpi_mem_fd, &rsdp, len, addr);
if (acpi_checksum(&rsdp, len)) /* Run the checksum only over the version 1 header. */
if (acpi_checksum(&rsdp, 20))
return (NULL); return (NULL);
if (rsdp.revision > 0) if (rsdp.revision == 0)
len = rsdp.length; return (NULL);
return (acpi_map_physical(addr, len));
/* XXX Should handle ACPI 2.0 RSDP extended checksum here. */
return (acpi_map_physical(addr, rsdp.length));
} }
/* /*