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We already know the rsdt length in advance,

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so map the whole table without freeing and remapping later


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@42105 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
jackburton 2011-06-11 19:54:56 +00:00
parent 4bcb62ee96
commit 14282c1e55
1 changed files with 3 additions and 9 deletions
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12
src/system/boot/platform/bios_ia32/acpi.cpp
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@ -46,23 +46,17 @@ acpi_check_rsdt(acpi_rsdp* rsdp)
// map and validate the root system description table
acpi_descriptor_header* rsdt
= (acpi_descriptor_header*)mmu_map_physical_memory(
rsdp->rsdt_address, sizeof(acpi_descriptor_header),
rsdp->rsdt_address, rsdp->rsdt_length,
kDefaultPageFlags);
if (rsdt == NULL
|| strncmp(rsdt->signature, ACPI_RSDT_SIGNATURE, 4) != 0) {
if (rsdt != NULL)
mmu_free(rsdt, sizeof(acpi_descriptor_header));
mmu_free(rsdt, rsdp->rsdt_length);
TRACE(("acpi: invalid root system description table\n"));
return B_ERROR;
}
// Map the whole table, not just the header
uint32 length = rsdt->length;
TRACE(("acpi: rsdt length: %lu\n", length));
mmu_free(rsdt, sizeof(acpi_descriptor_header));
sAcpiRsdt = (acpi_descriptor_header*)mmu_map_physical_memory(rsdp->rsdt_address,
length, kDefaultPageFlags);
sAcpiRsdt = rsdt;
return B_OK;
}