forked from luck/tmp_suning_uos_patched
2b932f6cf0
Recent GDT changes broke the SMP boot sequence if the booting CPU is numbered anything other than zero. There's also a subtle source of error in that the boot time CPU now uses cpu_gdt_table (which is actually the GDT for booting CPUs in head.S). This patch fixes both problems by making GDT descriptors themselves allocated from a per_cpu area and switching to them in cpu_init(), which now means that cpu_gdt_table is exclusively used for booting CPUs again. Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com> Cc: Zachary Amsden <zach@vmware.com> Cc: Matt Tolentino <metolent@snoqualmie.dp.intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
168 lines
4.2 KiB
C
168 lines
4.2 KiB
C
#ifndef __ARCH_DESC_H
|
|
#define __ARCH_DESC_H
|
|
|
|
#include <asm/ldt.h>
|
|
#include <asm/segment.h>
|
|
|
|
#define CPU_16BIT_STACK_SIZE 1024
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#include <linux/preempt.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/percpu.h>
|
|
|
|
#include <asm/mmu.h>
|
|
|
|
extern struct desc_struct cpu_gdt_table[GDT_ENTRIES];
|
|
|
|
DECLARE_PER_CPU(unsigned char, cpu_16bit_stack[CPU_16BIT_STACK_SIZE]);
|
|
|
|
struct Xgt_desc_struct {
|
|
unsigned short size;
|
|
unsigned long address __attribute__((packed));
|
|
unsigned short pad;
|
|
} __attribute__ ((packed));
|
|
|
|
extern struct Xgt_desc_struct idt_descr;
|
|
DECLARE_PER_CPU(struct Xgt_desc_struct, cpu_gdt_descr);
|
|
|
|
|
|
static inline struct desc_struct *get_cpu_gdt_table(unsigned int cpu)
|
|
{
|
|
return (struct desc_struct *)per_cpu(cpu_gdt_descr, cpu).address;
|
|
}
|
|
|
|
#define load_TR_desc() __asm__ __volatile__("ltr %w0"::"q" (GDT_ENTRY_TSS*8))
|
|
#define load_LDT_desc() __asm__ __volatile__("lldt %w0"::"q" (GDT_ENTRY_LDT*8))
|
|
|
|
#define load_gdt(dtr) __asm__ __volatile("lgdt %0"::"m" (*dtr))
|
|
#define load_idt(dtr) __asm__ __volatile("lidt %0"::"m" (*dtr))
|
|
#define load_tr(tr) __asm__ __volatile("ltr %0"::"mr" (tr))
|
|
#define load_ldt(ldt) __asm__ __volatile("lldt %0"::"mr" (ldt))
|
|
|
|
#define store_gdt(dtr) __asm__ ("sgdt %0":"=m" (*dtr))
|
|
#define store_idt(dtr) __asm__ ("sidt %0":"=m" (*dtr))
|
|
#define store_tr(tr) __asm__ ("str %0":"=mr" (tr))
|
|
#define store_ldt(ldt) __asm__ ("sldt %0":"=mr" (ldt))
|
|
|
|
/*
|
|
* This is the ldt that every process will get unless we need
|
|
* something other than this.
|
|
*/
|
|
extern struct desc_struct default_ldt[];
|
|
extern void set_intr_gate(unsigned int irq, void * addr);
|
|
|
|
#define _set_tssldt_desc(n,addr,limit,type) \
|
|
__asm__ __volatile__ ("movw %w3,0(%2)\n\t" \
|
|
"movw %w1,2(%2)\n\t" \
|
|
"rorl $16,%1\n\t" \
|
|
"movb %b1,4(%2)\n\t" \
|
|
"movb %4,5(%2)\n\t" \
|
|
"movb $0,6(%2)\n\t" \
|
|
"movb %h1,7(%2)\n\t" \
|
|
"rorl $16,%1" \
|
|
: "=m"(*(n)) : "q" (addr), "r"(n), "ir"(limit), "i"(type))
|
|
|
|
static inline void __set_tss_desc(unsigned int cpu, unsigned int entry, void *addr)
|
|
{
|
|
_set_tssldt_desc(&get_cpu_gdt_table(cpu)[entry], (int)addr,
|
|
offsetof(struct tss_struct, __cacheline_filler) - 1, 0x89);
|
|
}
|
|
|
|
#define set_tss_desc(cpu,addr) __set_tss_desc(cpu, GDT_ENTRY_TSS, addr)
|
|
|
|
static inline void set_ldt_desc(unsigned int cpu, void *addr, unsigned int size)
|
|
{
|
|
_set_tssldt_desc(&get_cpu_gdt_table(cpu)[GDT_ENTRY_LDT], (int)addr, ((size << 3)-1), 0x82);
|
|
}
|
|
|
|
#define LDT_entry_a(info) \
|
|
((((info)->base_addr & 0x0000ffff) << 16) | ((info)->limit & 0x0ffff))
|
|
|
|
#define LDT_entry_b(info) \
|
|
(((info)->base_addr & 0xff000000) | \
|
|
(((info)->base_addr & 0x00ff0000) >> 16) | \
|
|
((info)->limit & 0xf0000) | \
|
|
(((info)->read_exec_only ^ 1) << 9) | \
|
|
((info)->contents << 10) | \
|
|
(((info)->seg_not_present ^ 1) << 15) | \
|
|
((info)->seg_32bit << 22) | \
|
|
((info)->limit_in_pages << 23) | \
|
|
((info)->useable << 20) | \
|
|
0x7000)
|
|
|
|
#define LDT_empty(info) (\
|
|
(info)->base_addr == 0 && \
|
|
(info)->limit == 0 && \
|
|
(info)->contents == 0 && \
|
|
(info)->read_exec_only == 1 && \
|
|
(info)->seg_32bit == 0 && \
|
|
(info)->limit_in_pages == 0 && \
|
|
(info)->seg_not_present == 1 && \
|
|
(info)->useable == 0 )
|
|
|
|
static inline void write_ldt_entry(void *ldt, int entry, __u32 entry_a, __u32 entry_b)
|
|
{
|
|
__u32 *lp = (__u32 *)((char *)ldt + entry*8);
|
|
*lp = entry_a;
|
|
*(lp+1) = entry_b;
|
|
}
|
|
|
|
#if TLS_SIZE != 24
|
|
# error update this code.
|
|
#endif
|
|
|
|
static inline void load_TLS(struct thread_struct *t, unsigned int cpu)
|
|
{
|
|
#define C(i) get_cpu_gdt_table(cpu)[GDT_ENTRY_TLS_MIN + i] = t->tls_array[i]
|
|
C(0); C(1); C(2);
|
|
#undef C
|
|
}
|
|
|
|
static inline void clear_LDT(void)
|
|
{
|
|
int cpu = get_cpu();
|
|
|
|
set_ldt_desc(cpu, &default_ldt[0], 5);
|
|
load_LDT_desc();
|
|
put_cpu();
|
|
}
|
|
|
|
/*
|
|
* load one particular LDT into the current CPU
|
|
*/
|
|
static inline void load_LDT_nolock(mm_context_t *pc, int cpu)
|
|
{
|
|
void *segments = pc->ldt;
|
|
int count = pc->size;
|
|
|
|
if (likely(!count)) {
|
|
segments = &default_ldt[0];
|
|
count = 5;
|
|
}
|
|
|
|
set_ldt_desc(cpu, segments, count);
|
|
load_LDT_desc();
|
|
}
|
|
|
|
static inline void load_LDT(mm_context_t *pc)
|
|
{
|
|
int cpu = get_cpu();
|
|
load_LDT_nolock(pc, cpu);
|
|
put_cpu();
|
|
}
|
|
|
|
static inline unsigned long get_desc_base(unsigned long *desc)
|
|
{
|
|
unsigned long base;
|
|
base = ((desc[0] >> 16) & 0x0000ffff) |
|
|
((desc[1] << 16) & 0x00ff0000) |
|
|
(desc[1] & 0xff000000);
|
|
return base;
|
|
}
|
|
|
|
#endif /* !__ASSEMBLY__ */
|
|
|
|
#endif
|