[PATCH] x86: add an accessor function for getting the per-CPU gdt
Add an accessor function for getting the per-CPU gdt. Callee must already
have the CPU.
Signed-off-by: Zachary Amsden <zach@vmware.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/arch/i386/kernel/apm.c b/arch/i386/kernel/apm.c
index d7811c4..d2ef0c2 100644
--- a/arch/i386/kernel/apm.c
+++ b/arch/i386/kernel/apm.c
@@ -597,12 +597,14 @@
cpumask_t cpus;
int cpu;
struct desc_struct save_desc_40;
+ struct desc_struct *gdt;
cpus = apm_save_cpus();
cpu = get_cpu();
- save_desc_40 = per_cpu(cpu_gdt_table, cpu)[0x40 / 8];
- per_cpu(cpu_gdt_table, cpu)[0x40 / 8] = bad_bios_desc;
+ gdt = get_cpu_gdt_table(cpu);
+ save_desc_40 = gdt[0x40 / 8];
+ gdt[0x40 / 8] = bad_bios_desc;
local_save_flags(flags);
APM_DO_CLI;
@@ -610,7 +612,7 @@
apm_bios_call_asm(func, ebx_in, ecx_in, eax, ebx, ecx, edx, esi);
APM_DO_RESTORE_SEGS;
local_irq_restore(flags);
- per_cpu(cpu_gdt_table, cpu)[0x40 / 8] = save_desc_40;
+ gdt[0x40 / 8] = save_desc_40;
put_cpu();
apm_restore_cpus(cpus);
@@ -639,13 +641,14 @@
cpumask_t cpus;
int cpu;
struct desc_struct save_desc_40;
-
+ struct desc_struct *gdt;
cpus = apm_save_cpus();
cpu = get_cpu();
- save_desc_40 = per_cpu(cpu_gdt_table, cpu)[0x40 / 8];
- per_cpu(cpu_gdt_table, cpu)[0x40 / 8] = bad_bios_desc;
+ gdt = get_cpu_gdt_table(cpu);
+ save_desc_40 = gdt[0x40 / 8];
+ gdt[0x40 / 8] = bad_bios_desc;
local_save_flags(flags);
APM_DO_CLI;
@@ -653,7 +656,7 @@
error = apm_bios_call_simple_asm(func, ebx_in, ecx_in, eax);
APM_DO_RESTORE_SEGS;
local_irq_restore(flags);
- __get_cpu_var(cpu_gdt_table)[0x40 / 8] = save_desc_40;
+ gdt[0x40 / 8] = save_desc_40;
put_cpu();
apm_restore_cpus(cpus);
return error;
@@ -2295,35 +2298,36 @@
apm_bios_entry.segment = APM_CS;
for (i = 0; i < NR_CPUS; i++) {
- set_base(per_cpu(cpu_gdt_table, i)[APM_CS >> 3],
+ struct desc_struct *gdt = get_cpu_gdt_table(i);
+ set_base(gdt[APM_CS >> 3],
__va((unsigned long)apm_info.bios.cseg << 4));
- set_base(per_cpu(cpu_gdt_table, i)[APM_CS_16 >> 3],
+ set_base(gdt[APM_CS_16 >> 3],
__va((unsigned long)apm_info.bios.cseg_16 << 4));
- set_base(per_cpu(cpu_gdt_table, i)[APM_DS >> 3],
+ set_base(gdt[APM_DS >> 3],
__va((unsigned long)apm_info.bios.dseg << 4));
#ifndef APM_RELAX_SEGMENTS
if (apm_info.bios.version == 0x100) {
#endif
/* For ASUS motherboard, Award BIOS rev 110 (and others?) */
- _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_CS >> 3], 64 * 1024 - 1);
+ _set_limit((char *)&gdt[APM_CS >> 3], 64 * 1024 - 1);
/* For some unknown machine. */
- _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_CS_16 >> 3], 64 * 1024 - 1);
+ _set_limit((char *)&gdt[APM_CS_16 >> 3], 64 * 1024 - 1);
/* For the DEC Hinote Ultra CT475 (and others?) */
- _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_DS >> 3], 64 * 1024 - 1);
+ _set_limit((char *)&gdt[APM_DS >> 3], 64 * 1024 - 1);
#ifndef APM_RELAX_SEGMENTS
} else {
- _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_CS >> 3],
+ _set_limit((char *)&gdt[APM_CS >> 3],
(apm_info.bios.cseg_len - 1) & 0xffff);
- _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_CS_16 >> 3],
+ _set_limit((char *)&gdt[APM_CS_16 >> 3],
(apm_info.bios.cseg_16_len - 1) & 0xffff);
- _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_DS >> 3],
+ _set_limit((char *)&gdt[APM_DS >> 3],
(apm_info.bios.dseg_len - 1) & 0xffff);
/* workaround for broken BIOSes */
if (apm_info.bios.cseg_len <= apm_info.bios.offset)
- _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_CS >> 3], 64 * 1024 -1);
+ _set_limit((char *)&gdt[APM_CS >> 3], 64 * 1024 -1);
if (apm_info.bios.dseg_len <= 0x40) { /* 0x40 * 4kB == 64kB */
/* for the BIOS that assumes granularity = 1 */
- per_cpu(cpu_gdt_table, i)[APM_DS >> 3].b |= 0x800000;
+ gdt[APM_DS >> 3].b |= 0x800000;
printk(KERN_NOTICE "apm: we set the granularity of dseg.\n");
}
}