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https://github.com/edk2-porting/linux-next.git
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f51c94528a
This patch uses the read and write functions provided at system.h for control registers instead of writting raw assembly over and over again in .c files. Functions to manipulate cr2 and cr8 were provided, as they were lacking. Also, removed some extra space after closing brackets Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
181 lines
4.5 KiB
C
181 lines
4.5 KiB
C
#ifndef __ASM_SYSTEM_H
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#define __ASM_SYSTEM_H
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#include <linux/kernel.h>
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#include <asm/segment.h>
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#include <asm/cmpxchg.h>
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#ifdef __KERNEL__
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#define __STR(x) #x
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#define STR(x) __STR(x)
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#define __SAVE(reg,offset) "movq %%" #reg ",(14-" #offset ")*8(%%rsp)\n\t"
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#define __RESTORE(reg,offset) "movq (14-" #offset ")*8(%%rsp),%%" #reg "\n\t"
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/* frame pointer must be last for get_wchan */
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#define SAVE_CONTEXT "pushf ; pushq %%rbp ; movq %%rsi,%%rbp\n\t"
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#define RESTORE_CONTEXT "movq %%rbp,%%rsi ; popq %%rbp ; popf\t"
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#define __EXTRA_CLOBBER \
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,"rcx","rbx","rdx","r8","r9","r10","r11","r12","r13","r14","r15"
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/* Save restore flags to clear handle leaking NT */
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#define switch_to(prev,next,last) \
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asm volatile(SAVE_CONTEXT \
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"movq %%rsp,%P[threadrsp](%[prev])\n\t" /* save RSP */ \
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"movq %P[threadrsp](%[next]),%%rsp\n\t" /* restore RSP */ \
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"call __switch_to\n\t" \
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".globl thread_return\n" \
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"thread_return:\n\t" \
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"movq %%gs:%P[pda_pcurrent],%%rsi\n\t" \
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"movq %P[thread_info](%%rsi),%%r8\n\t" \
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LOCK_PREFIX "btr %[tif_fork],%P[ti_flags](%%r8)\n\t" \
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"movq %%rax,%%rdi\n\t" \
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"jc ret_from_fork\n\t" \
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RESTORE_CONTEXT \
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: "=a" (last) \
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: [next] "S" (next), [prev] "D" (prev), \
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[threadrsp] "i" (offsetof(struct task_struct, thread.rsp)), \
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[ti_flags] "i" (offsetof(struct thread_info, flags)),\
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[tif_fork] "i" (TIF_FORK), \
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[thread_info] "i" (offsetof(struct task_struct, stack)), \
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[pda_pcurrent] "i" (offsetof(struct x8664_pda, pcurrent)) \
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: "memory", "cc" __EXTRA_CLOBBER)
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extern void load_gs_index(unsigned);
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/*
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* Load a segment. Fall back on loading the zero
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* segment if something goes wrong..
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*/
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#define loadsegment(seg,value) \
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asm volatile("\n" \
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"1:\t" \
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"movl %k0,%%" #seg "\n" \
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"2:\n" \
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".section .fixup,\"ax\"\n" \
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"3:\t" \
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"movl %1,%%" #seg "\n\t" \
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"jmp 2b\n" \
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".previous\n" \
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".section __ex_table,\"a\"\n\t" \
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".align 8\n\t" \
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".quad 1b,3b\n" \
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".previous" \
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: :"r" (value), "r" (0))
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/*
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* Clear and set 'TS' bit respectively
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*/
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#define clts() __asm__ __volatile__ ("clts")
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static inline unsigned long read_cr0(void)
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{
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unsigned long cr0;
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asm volatile("movq %%cr0,%0" : "=r" (cr0));
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return cr0;
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}
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static inline void write_cr0(unsigned long val)
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{
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asm volatile("movq %0,%%cr0" :: "r" (val));
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}
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static inline unsigned long read_cr2(void)
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{
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unsigned long cr2;
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asm("movq %%cr2,%0" : "=r" (cr2));
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return cr2;
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}
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static inline void write_cr2(unsigned long val)
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{
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asm volatile("movq %0,%%cr2" :: "r" (val));
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}
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static inline unsigned long read_cr3(void)
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{
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unsigned long cr3;
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asm("movq %%cr3,%0" : "=r" (cr3));
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return cr3;
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}
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static inline void write_cr3(unsigned long val)
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{
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asm volatile("movq %0,%%cr3" :: "r" (val) : "memory");
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}
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static inline unsigned long read_cr4(void)
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{
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unsigned long cr4;
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asm("movq %%cr4,%0" : "=r" (cr4));
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return cr4;
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}
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static inline void write_cr4(unsigned long val)
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{
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asm volatile("movq %0,%%cr4" :: "r" (val) : "memory");
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}
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static inline unsigned long read_cr8(void)
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{
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unsigned long cr8;
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asm("movq %%cr8,%0" : "=r" (cr8));
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return cr8;
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}
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static inline void write_cr8(unsigned long val)
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{
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asm volatile("movq %0,%%cr8" :: "r" (val) : "memory");
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}
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#define stts() write_cr0(8 | read_cr0())
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#define wbinvd() \
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__asm__ __volatile__ ("wbinvd": : :"memory")
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#endif /* __KERNEL__ */
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#define nop() __asm__ __volatile__ ("nop")
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#ifdef CONFIG_SMP
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#define smp_mb() mb()
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#define smp_rmb() rmb()
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#define smp_wmb() wmb()
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#define smp_read_barrier_depends() do {} while(0)
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#else
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#define smp_mb() barrier()
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#define smp_rmb() barrier()
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#define smp_wmb() barrier()
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#define smp_read_barrier_depends() do {} while(0)
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#endif
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/*
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* Force strict CPU ordering.
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* And yes, this is required on UP too when we're talking
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* to devices.
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*/
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#define mb() asm volatile("mfence":::"memory")
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#define rmb() asm volatile("lfence":::"memory")
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#ifdef CONFIG_UNORDERED_IO
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#define wmb() asm volatile("sfence" ::: "memory")
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#else
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#define wmb() asm volatile("" ::: "memory")
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#endif
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#define read_barrier_depends() do {} while(0)
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#define set_mb(var, value) do { (void) xchg(&var, value); } while (0)
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#define warn_if_not_ulong(x) do { unsigned long foo; (void) (&(x) == &foo); } while (0)
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#include <linux/irqflags.h>
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void cpu_idle_wait(void);
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extern unsigned long arch_align_stack(unsigned long sp);
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extern void free_init_pages(char *what, unsigned long begin, unsigned long end);
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#endif
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