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Unify the start/size parameters for the RSDP search area. Don't bother

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trying to exclude the top end of the range since it should hurt to overlap
by 4 bytes in the off-chance the RSDP signature appears incorrectly at the
very top of our search space.
This commit is contained in:
Nate Lawson 2004-05-28 07:25:23 +00:00
parent 043498df33
commit a773b841f2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=129808
2 changed files with 6 additions and 4 deletions
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4
usr.sbin/acpi/acpidump/acpi_user.c
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@ -142,7 +142,9 @@ acpi_scan_rsd_ptr(void)
for (; addr < end; addr += 16)
if ((rsdp = acpi_get_rsdp(addr)) != NULL)
return (rsdp);
for (addr = RSDP_HI_START; addr < RSDP_HI_END; addr += 16)
addr = RSDP_HI_START;
end = addr + RSDP_HI_SIZE;
for (; addr < end; addr += 16)
if ((rsdp = acpi_get_rsdp(addr)) != NULL)
return (rsdp);
#endif /* __i386__ */

6
usr.sbin/acpi/acpidump/acpidump.h
View File

@ -296,13 +296,13 @@ struct ECDTbody {
/*
* Addresses to scan on ia32 for the RSD PTR. According to section 5.2.2
* of the ACPI spec, we only consider two regions for the base address:
* 1. EBDA (0x0 - 0x3FF)
* 1. EBDA (1 KB area addressed to by 16 bit pointer at 0x40E)
* 2. High memory (0xE0000 - 0xFFFFF)
*/
#define RSDP_EBDA_PTR 0x40E
#define RSDP_EBDA_SIZE (1024 - sizeof(struct ACPIrsdp))
#define RSDP_EBDA_SIZE 0x400
#define RSDP_HI_START 0xE0000
#define RSDP_HI_END (0x100000 - sizeof(struct ACPIrsdp))
#define RSDP_HI_SIZE 0x20000
/* Find and map the RSD PTR structure and return it for parsing */
struct ACPIsdt *sdt_load_devmem(void);