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[PATCH] x86: Fixed pnp bios limits

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PnP BIOS data, code, and 32-bit entry segments all have fixed limits as well;
set them in the GDT rather than adding more code.  It would be nice to add
these fixups to the boot GDT rather than setting the GDT for each CPU; perhaps
I can wiggle this in later, but getting it in before the subsys init looks
tricky.

Also, make some progress on deprecating the ugly Q_SET_SEL macros.

Signed-off-by: Zachary Amsden <zach@vmware.com>
Cc: "Seth, Rohit" <rohit.seth@intel.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Zachary Amsden 2006-01-06 00:11:56 -08:00 committed by Linus Torvalds
parent 5fe9fe3c6f
commit e6a9918c96
2 changed files with 12 additions and 15 deletions
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12
arch/i386/kernel/head.S
View file

@ -504,10 +504,14 @@ ENTRY(cpu_gdt_table)
.quad 0x0000000000000000 /* 0x80 TSS descriptor */ .quad 0x0000000000000000 /* 0x80 TSS descriptor */
.quad 0x0000000000000000 /* 0x88 LDT descriptor */ .quad 0x0000000000000000 /* 0x88 LDT descriptor */
/* Segments used for calling PnP BIOS have byte granularity */ /*
.quad 0x00409a0000000000 /* 0x90 32-bit code */ * Segments used for calling PnP BIOS have byte granularity.
.quad 0x00009a0000000000 /* 0x98 16-bit code */ * They code segments and data segments have fixed 64k limits,
.quad 0x0000920000000000 /* 0xa0 16-bit data */ * the transfer segment sizes are set at run time.
*/
.quad 0x00409a000000ffff /* 0x90 32-bit code */
.quad 0x00009a000000ffff /* 0x98 16-bit code */
.quad 0x000092000000ffff /* 0xa0 16-bit data */
.quad 0x0000920000000000 /* 0xa8 16-bit data */ .quad 0x0000920000000000 /* 0xa8 16-bit data */
.quad 0x0000920000000000 /* 0xb0 16-bit data */ .quad 0x0000920000000000 /* 0xb0 16-bit data */

15
drivers/pnp/pnpbios/bioscalls.c
View file

@ -58,13 +58,6 @@ __asm__(
".previous \n" ".previous \n"
); );
#define Q_SET_SEL(cpu, selname, address, size) \
do { \
struct desc_struct *gdt = get_cpu_gdt_table((cpu)); \
set_base(gdt[(selname) >> 3], __va((u32)(address))); \
set_limit(gdt[(selname) >> 3], size); \
} while(0)
#define Q2_SET_SEL(cpu, selname, address, size) \ #define Q2_SET_SEL(cpu, selname, address, size) \
do { \ do { \
struct desc_struct *gdt = get_cpu_gdt_table((cpu)); \ struct desc_struct *gdt = get_cpu_gdt_table((cpu)); \
@ -535,8 +528,8 @@ void pnpbios_calls_init(union pnp_bios_install_struct *header)
struct desc_struct *gdt = get_cpu_gdt_table(i); struct desc_struct *gdt = get_cpu_gdt_table(i);
if (!gdt) if (!gdt)
continue; continue;
Q2_SET_SEL(i, PNP_CS32, &pnp_bios_callfunc, 64 * 1024); set_base(gdt[GDT_ENTRY_PNPBIOS_CS32], &pnp_bios_callfunc);
Q_SET_SEL(i, PNP_CS16, header->fields.pm16cseg, 64 * 1024); set_base(gdt[GDT_ENTRY_PNPBIOS_CS16], __va(header->fields.pm16cseg));
Q_SET_SEL(i, PNP_DS, header->fields.pm16dseg, 64 * 1024); set_base(gdt[GDT_ENTRY_PNPBIOS_DS], __va(header->fields.pm16dseg));
} }
} }