From 90a0a06aa81692028864c21f981905fda46b1208 Mon Sep 17 00:00:00 2001 From: Rusty Russell Date: Wed, 2 May 2007 19:27:10 +0200 Subject: [PATCH] i386: rationalize paravirt wrappers paravirt.c used to implement native versions of all low-level functions. Far cleaner is to have the native versions exposed in the headers and as inline native_XXX, and if !CONFIG_PARAVIRT, then simply #define XXX native_XXX. There are several nice side effects: 1) write_dt_entry() now takes the correct "struct Xgt_desc_struct *" not "void *". 2) load_TLS is reintroduced to the for loop, not manually unrolled with a #error in case the bounds ever change. 3) Macros become inlines, with type checking. 4) Access to the native versions is trivial for KVM, lguest, Xen and others who might want it. Signed-off-by: Jeremy Fitzhardinge Signed-off-by: Rusty Russell Signed-off-by: Andi Kleen Cc: Andi Kleen Cc: Avi Kivity Signed-off-by: Andrew Morton --- arch/i386/kernel/paravirt.c | 293 +------------------------------------------- 1 file changed, 5 insertions(+), 288 deletions(-) (limited to 'arch/i386/kernel/paravirt.c') diff --git a/arch/i386/kernel/paravirt.c b/arch/i386/kernel/paravirt.c index 2ec331e03fa9..47698756aec5 100644 --- a/arch/i386/kernel/paravirt.c +++ b/arch/i386/kernel/paravirt.c @@ -93,294 +93,11 @@ static unsigned native_patch(u8 type, u16 clobbers, void *insns, unsigned len) return insn_len; } -static unsigned long native_get_debugreg(int regno) -{ - unsigned long val = 0; /* Damn you, gcc! */ - - switch (regno) { - case 0: - asm("movl %%db0, %0" :"=r" (val)); break; - case 1: - asm("movl %%db1, %0" :"=r" (val)); break; - case 2: - asm("movl %%db2, %0" :"=r" (val)); break; - case 3: - asm("movl %%db3, %0" :"=r" (val)); break; - case 6: - asm("movl %%db6, %0" :"=r" (val)); break; - case 7: - asm("movl %%db7, %0" :"=r" (val)); break; - default: - BUG(); - } - return val; -} - -static void native_set_debugreg(int regno, unsigned long value) -{ - switch (regno) { - case 0: - asm("movl %0,%%db0" : /* no output */ :"r" (value)); - break; - case 1: - asm("movl %0,%%db1" : /* no output */ :"r" (value)); - break; - case 2: - asm("movl %0,%%db2" : /* no output */ :"r" (value)); - break; - case 3: - asm("movl %0,%%db3" : /* no output */ :"r" (value)); - break; - case 6: - asm("movl %0,%%db6" : /* no output */ :"r" (value)); - break; - case 7: - asm("movl %0,%%db7" : /* no output */ :"r" (value)); - break; - default: - BUG(); - } -} - void init_IRQ(void) { paravirt_ops.init_IRQ(); } -static void native_clts(void) -{ - asm volatile ("clts"); -} - -static unsigned long native_read_cr0(void) -{ - unsigned long val; - asm volatile("movl %%cr0,%0\n\t" :"=r" (val)); - return val; -} - -static void native_write_cr0(unsigned long val) -{ - asm volatile("movl %0,%%cr0": :"r" (val)); -} - -static unsigned long native_read_cr2(void) -{ - unsigned long val; - asm volatile("movl %%cr2,%0\n\t" :"=r" (val)); - return val; -} - -static void native_write_cr2(unsigned long val) -{ - asm volatile("movl %0,%%cr2": :"r" (val)); -} - -static unsigned long native_read_cr3(void) -{ - unsigned long val; - asm volatile("movl %%cr3,%0\n\t" :"=r" (val)); - return val; -} - -static void native_write_cr3(unsigned long val) -{ - asm volatile("movl %0,%%cr3": :"r" (val)); -} - -static unsigned long native_read_cr4(void) -{ - unsigned long val; - asm volatile("movl %%cr4,%0\n\t" :"=r" (val)); - return val; -} - -static unsigned long native_read_cr4_safe(void) -{ - unsigned long val; - /* This could fault if %cr4 does not exist */ - asm("1: movl %%cr4, %0 \n" - "2: \n" - ".section __ex_table,\"a\" \n" - ".long 1b,2b \n" - ".previous \n" - : "=r" (val): "0" (0)); - return val; -} - -static void native_write_cr4(unsigned long val) -{ - asm volatile("movl %0,%%cr4": :"r" (val)); -} - -static unsigned long native_save_fl(void) -{ - unsigned long f; - asm volatile("pushfl ; popl %0":"=g" (f): /* no input */); - return f; -} - -static void native_restore_fl(unsigned long f) -{ - asm volatile("pushl %0 ; popfl": /* no output */ - :"g" (f) - :"memory", "cc"); -} - -static void native_irq_disable(void) -{ - asm volatile("cli": : :"memory"); -} - -static void native_irq_enable(void) -{ - asm volatile("sti": : :"memory"); -} - -static void native_safe_halt(void) -{ - asm volatile("sti; hlt": : :"memory"); -} - -static void native_halt(void) -{ - asm volatile("hlt": : :"memory"); -} - -static void native_wbinvd(void) -{ - asm volatile("wbinvd": : :"memory"); -} - -static unsigned long long native_read_msr(unsigned int msr, int *err) -{ - unsigned long long val; - - asm volatile("2: rdmsr ; xorl %0,%0\n" - "1:\n\t" - ".section .fixup,\"ax\"\n\t" - "3: movl %3,%0 ; jmp 1b\n\t" - ".previous\n\t" - ".section __ex_table,\"a\"\n" - " .align 4\n\t" - " .long 2b,3b\n\t" - ".previous" - : "=r" (*err), "=A" (val) - : "c" (msr), "i" (-EFAULT)); - - return val; -} - -static int native_write_msr(unsigned int msr, unsigned long long val) -{ - int err; - asm volatile("2: wrmsr ; xorl %0,%0\n" - "1:\n\t" - ".section .fixup,\"ax\"\n\t" - "3: movl %4,%0 ; jmp 1b\n\t" - ".previous\n\t" - ".section __ex_table,\"a\"\n" - " .align 4\n\t" - " .long 2b,3b\n\t" - ".previous" - : "=a" (err) - : "c" (msr), "0" ((u32)val), "d" ((u32)(val>>32)), - "i" (-EFAULT)); - return err; -} - -static unsigned long long native_read_tsc(void) -{ - unsigned long long val; - asm volatile("rdtsc" : "=A" (val)); - return val; -} - -static unsigned long long native_read_pmc(void) -{ - unsigned long long val; - asm volatile("rdpmc" : "=A" (val)); - return val; -} - -static void native_load_tr_desc(void) -{ - asm volatile("ltr %w0"::"q" (GDT_ENTRY_TSS*8)); -} - -static void native_load_gdt(const struct Xgt_desc_struct *dtr) -{ - asm volatile("lgdt %0"::"m" (*dtr)); -} - -static void native_load_idt(const struct Xgt_desc_struct *dtr) -{ - asm volatile("lidt %0"::"m" (*dtr)); -} - -static void native_store_gdt(struct Xgt_desc_struct *dtr) -{ - asm ("sgdt %0":"=m" (*dtr)); -} - -static void native_store_idt(struct Xgt_desc_struct *dtr) -{ - asm ("sidt %0":"=m" (*dtr)); -} - -static unsigned long native_store_tr(void) -{ - unsigned long tr; - asm ("str %0":"=r" (tr)); - return tr; -} - -static void native_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 native_write_dt_entry(void *dt, int entry, u32 entry_low, u32 entry_high) -{ - u32 *lp = (u32 *)((char *)dt + entry*8); - lp[0] = entry_low; - lp[1] = entry_high; -} - -static void native_write_ldt_entry(void *dt, int entrynum, u32 low, u32 high) -{ - native_write_dt_entry(dt, entrynum, low, high); -} - -static void native_write_gdt_entry(void *dt, int entrynum, u32 low, u32 high) -{ - native_write_dt_entry(dt, entrynum, low, high); -} - -static void native_write_idt_entry(void *dt, int entrynum, u32 low, u32 high) -{ - native_write_dt_entry(dt, entrynum, low, high); -} - -static void native_load_esp0(struct tss_struct *tss, - struct thread_struct *thread) -{ - tss->esp0 = thread->esp0; - - /* This can only happen when SEP is enabled, no need to test "SEP"arately */ - if (unlikely(tss->ss1 != thread->sysenter_cs)) { - tss->ss1 = thread->sysenter_cs; - wrmsr(MSR_IA32_SYSENTER_CS, thread->sysenter_cs, 0); - } -} - -static void native_io_delay(void) -{ - asm volatile("outb %al,$0x80"); -} - static void native_flush_tlb(void) { __native_flush_tlb(); @@ -517,8 +234,8 @@ struct paravirt_ops paravirt_ops = { .safe_halt = native_safe_halt, .halt = native_halt, .wbinvd = native_wbinvd, - .read_msr = native_read_msr, - .write_msr = native_write_msr, + .read_msr = native_read_msr_safe, + .write_msr = native_write_msr_safe, .read_tsc = native_read_tsc, .read_pmc = native_read_pmc, .get_scheduled_cycles = native_read_tsc, @@ -531,9 +248,9 @@ struct paravirt_ops paravirt_ops = { .store_idt = native_store_idt, .store_tr = native_store_tr, .load_tls = native_load_tls, - .write_ldt_entry = native_write_ldt_entry, - .write_gdt_entry = native_write_gdt_entry, - .write_idt_entry = native_write_idt_entry, + .write_ldt_entry = write_dt_entry, + .write_gdt_entry = write_dt_entry, + .write_idt_entry = write_dt_entry, .load_esp0 = native_load_esp0, .set_iopl_mask = native_set_iopl_mask, -- cgit v1.2.3-59-g8ed1b