x86, um: ... and asm-x86 move

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 425 insertions, 0 deletions

diff --git a/arch/x86/include/asm/system.h b/arch/x86/include/asm/system.h
new file mode 100644
index 000000000000..b20c894660f9
--- /dev/null
+++ b/arch/x86/include/asm/system.h
@@ -0,0 +1,425 @@
+#ifndef ASM_X86__SYSTEM_H
+#define ASM_X86__SYSTEM_H
+
+#include <asm/asm.h>
+#include <asm/segment.h>
+#include <asm/cpufeature.h>
+#include <asm/cmpxchg.h>
+#include <asm/nops.h>
+
+#include <linux/kernel.h>
+#include <linux/irqflags.h>
+
+/* entries in ARCH_DLINFO: */
+#ifdef CONFIG_IA32_EMULATION
+# define AT_VECTOR_SIZE_ARCH 2
+#else
+# define AT_VECTOR_SIZE_ARCH 1
+#endif
+
+#ifdef CONFIG_X86_32
+
+struct task_struct; /* one of the stranger aspects of C forward declarations */
+struct task_struct *__switch_to(struct task_struct *prev,
+                                struct task_struct *next);
+
+/*
+ * Saving eflags is important. It switches not only IOPL between tasks,
+ * it also protects other tasks from NT leaking through sysenter etc.
+ */
+#define switch_to(prev, next, last)                                     \
+do {                                                                    \
+        /*                                                              \
+         * Context-switching clobbers all registers, so we clobber      \
+         * them explicitly, via unused output variables.                \
+         * (EAX and EBP is not listed because EBP is saved/restored     \
+         * explicitly for wchan access and EAX is the return value of   \
+         * __switch_to())                                               \
+         */                                                             \
+        unsigned long ebx, ecx, edx, esi, edi;                          \
+                                                                        \
+        asm volatile("pushfl\n\t"               /* save    flags */     \
+                     "pushl %%ebp\n\t"          /* save    EBP   */     \
+                     "movl %%esp,%[prev_sp]\n\t"        /* save    ESP   */ \
+                     "movl %[next_sp],%%esp\n\t"        /* restore ESP   */ \
+                     "movl $1f,%[prev_ip]\n\t"  /* save    EIP   */     \
+                     "pushl %[next_ip]\n\t"     /* restore EIP   */     \
+                     "jmp __switch_to\n"        /* regparm call  */     \
+                     "1:\t"                                             \
+                     "popl %%ebp\n\t"           /* restore EBP   */     \
+                     "popfl\n"                  /* restore flags */     \
+                                                                        \
+                     /* output parameters */                            \
+                     : [prev_sp] "=m" (prev->thread.sp),                \
+                       [prev_ip] "=m" (prev->thread.ip),                \
+                       "=a" (last),                                     \
+                                                                        \
+                       /* clobbered output registers: */                \
+                       "=b" (ebx), "=c" (ecx), "=d" (edx),              \
+                       "=S" (esi), "=D" (edi)                           \
+                                                                        \
+                       /* input parameters: */                          \
+                     : [next_sp]  "m" (next->thread.sp),                \
+                       [next_ip]  "m" (next->thread.ip),                \
+                                                                        \
+                       /* regparm parameters for __switch_to(): */      \
+                       [prev]     "a" (prev),                           \
+                       [next]     "d" (next)                            \
+                                                                        \
+                     : /* reloaded segment registers */                 \
+                        "memory");                                      \
+} while (0)
+
+/*
+ * disable hlt during certain critical i/o operations
+ */
+#define HAVE_DISABLE_HLT
+#else
+#define __SAVE(reg, offset) "movq %%" #reg ",(14-" #offset ")*8(%%rsp)\n\t"
+#define __RESTORE(reg, offset) "movq (14-" #offset ")*8(%%rsp),%%" #reg "\n\t"
+
+/* frame pointer must be last for get_wchan */
+#define SAVE_CONTEXT    "pushf ; pushq %%rbp ; movq %%rsi,%%rbp\n\t"
+#define RESTORE_CONTEXT "movq %%rbp,%%rsi ; popq %%rbp ; popf\t"
+
+#define __EXTRA_CLOBBER  \
+        , "rcx", "rbx", "rdx", "r8", "r9", "r10", "r11", \
+          "r12", "r13", "r14", "r15"
+
+/* Save restore flags to clear handle leaking NT */
+#define switch_to(prev, next, last) \
+        asm volatile(SAVE_CONTEXT                                                   \
+             "movq %%rsp,%P[threadrsp](%[prev])\n\t" /* save RSP */       \
+             "movq %P[threadrsp](%[next]),%%rsp\n\t" /* restore RSP */    \
+             "call __switch_to\n\t"                                       \
+             ".globl thread_return\n"                                     \
+             "thread_return:\n\t"                                         \
+             "movq %%gs:%P[pda_pcurrent],%%rsi\n\t"                       \
+             "movq %P[thread_info](%%rsi),%%r8\n\t"                       \
+             LOCK_PREFIX "btr  %[tif_fork],%P[ti_flags](%%r8)\n\t"        \
+             "movq %%rax,%%rdi\n\t"                                       \
+             "jc   ret_from_fork\n\t"                                     \
+             RESTORE_CONTEXT                                              \
+             : "=a" (last)                                                \
+             : [next] "S" (next), [prev] "D" (prev),                      \
+               [threadrsp] "i" (offsetof(struct task_struct, thread.sp)), \
+               [ti_flags] "i" (offsetof(struct thread_info, flags)),      \
+               [tif_fork] "i" (TIF_FORK),                                 \
+               [thread_info] "i" (offsetof(struct task_struct, stack)),   \
+               [pda_pcurrent] "i" (offsetof(struct x8664_pda, pcurrent))  \
+             : "memory", "cc" __EXTRA_CLOBBER)
+#endif
+
+#ifdef __KERNEL__
+#define _set_base(addr, base) do { unsigned long __pr; \
+__asm__ __volatile__ ("movw %%dx,%1\n\t" \
+        "rorl $16,%%edx\n\t" \
+        "movb %%dl,%2\n\t" \
+        "movb %%dh,%3" \
+        :"=&d" (__pr) \
+        :"m" (*((addr)+2)), \
+         "m" (*((addr)+4)), \
+         "m" (*((addr)+7)), \
+         "0" (base) \
+        ); } while (0)
+
+#define _set_limit(addr, limit) do { unsigned long __lr; \
+__asm__ __volatile__ ("movw %%dx,%1\n\t" \
+        "rorl $16,%%edx\n\t" \
+        "movb %2,%%dh\n\t" \
+        "andb $0xf0,%%dh\n\t" \
+        "orb %%dh,%%dl\n\t" \
+        "movb %%dl,%2" \
+        :"=&d" (__lr) \
+        :"m" (*(addr)), \
+         "m" (*((addr)+6)), \
+         "0" (limit) \
+        ); } while (0)
+
+#define set_base(ldt, base) _set_base(((char *)&(ldt)) , (base))
+#define set_limit(ldt, limit) _set_limit(((char *)&(ldt)) , ((limit)-1))
+
+extern void native_load_gs_index(unsigned);
+
+/*
+ * Load a segment. Fall back on loading the zero
+ * segment if something goes wrong..
+ */
+#define loadsegment(seg, value)                 \
+        asm volatile("\n"                       \
+                     "1:\t"                     \
+                     "movl %k0,%%" #seg "\n"    \
+                     "2:\n"                     \
+                     ".section .fixup,\"ax\"\n" \
+                     "3:\t"                     \
+                     "movl %k1, %%" #seg "\n\t" \
+                     "jmp 2b\n"                 \
+                     ".previous\n"              \
+                     _ASM_EXTABLE(1b,3b)        \
+                     : :"r" (value), "r" (0) : "memory")
+
+
+/*
+ * Save a segment register away
+ */
+#define savesegment(seg, value)                         \
+        asm("mov %%" #seg ",%0":"=r" (value) : : "memory")
+
+static inline unsigned long get_limit(unsigned long segment)
+{
+        unsigned long __limit;
+        asm("lsll %1,%0" : "=r" (__limit) : "r" (segment));
+        return __limit + 1;
+}
+
+static inline void native_clts(void)
+{
+        asm volatile("clts");
+}
+
+/*
+ * Volatile isn't enough to prevent the compiler from reordering the
+ * read/write functions for the control registers and messing everything up.
+ * A memory clobber would solve the problem, but would prevent reordering of
+ * all loads stores around it, which can hurt performance. Solution is to
+ * use a variable and mimic reads and writes to it to enforce serialization
+ */
+static unsigned long __force_order;
+
+static inline unsigned long native_read_cr0(void)
+{
+        unsigned long val;
+        asm volatile("mov %%cr0,%0\n\t" : "=r" (val), "=m" (__force_order));
+        return val;
+}
+
+static inline void native_write_cr0(unsigned long val)
+{
+        asm volatile("mov %0,%%cr0": : "r" (val), "m" (__force_order));
+}
+
+static inline unsigned long native_read_cr2(void)
+{
+        unsigned long val;
+        asm volatile("mov %%cr2,%0\n\t" : "=r" (val), "=m" (__force_order));
+        return val;
+}
+
+static inline void native_write_cr2(unsigned long val)
+{
+        asm volatile("mov %0,%%cr2": : "r" (val), "m" (__force_order));
+}
+
+static inline unsigned long native_read_cr3(void)
+{
+        unsigned long val;
+        asm volatile("mov %%cr3,%0\n\t" : "=r" (val), "=m" (__force_order));
+        return val;
+}
+
+static inline void native_write_cr3(unsigned long val)
+{
+        asm volatile("mov %0,%%cr3": : "r" (val), "m" (__force_order));
+}
+
+static inline unsigned long native_read_cr4(void)
+{
+        unsigned long val;
+        asm volatile("mov %%cr4,%0\n\t" : "=r" (val), "=m" (__force_order));
+        return val;
+}
+
+static inline unsigned long native_read_cr4_safe(void)
+{
+        unsigned long val;
+        /* This could fault if %cr4 does not exist. In x86_64, a cr4 always
+         * exists, so it will never fail. */
+#ifdef CONFIG_X86_32
+        asm volatile("1: mov %%cr4, %0\n"
+                     "2:\n"
+                     _ASM_EXTABLE(1b, 2b)
+                     : "=r" (val), "=m" (__force_order) : "0" (0));
+#else
+        val = native_read_cr4();
+#endif
+        return val;
+}
+
+static inline void native_write_cr4(unsigned long val)
+{
+        asm volatile("mov %0,%%cr4": : "r" (val), "m" (__force_order));
+}
+
+#ifdef CONFIG_X86_64
+static inline unsigned long native_read_cr8(void)
+{
+        unsigned long cr8;
+        asm volatile("movq %%cr8,%0" : "=r" (cr8));
+        return cr8;
+}
+
+static inline void native_write_cr8(unsigned long val)
+{
+        asm volatile("movq %0,%%cr8" :: "r" (val) : "memory");
+}
+#endif
+
+static inline void native_wbinvd(void)
+{
+        asm volatile("wbinvd": : :"memory");
+}
+
+#ifdef CONFIG_PARAVIRT
+#include <asm/paravirt.h>
+#else
+#define read_cr0()      (native_read_cr0())
+#define write_cr0(x)    (native_write_cr0(x))
+#define read_cr2()      (native_read_cr2())
+#define write_cr2(x)    (native_write_cr2(x))
+#define read_cr3()      (native_read_cr3())
+#define write_cr3(x)    (native_write_cr3(x))
+#define read_cr4()      (native_read_cr4())
+#define read_cr4_safe() (native_read_cr4_safe())
+#define write_cr4(x)    (native_write_cr4(x))
+#define wbinvd()        (native_wbinvd())
+#ifdef CONFIG_X86_64
+#define read_cr8()      (native_read_cr8())
+#define write_cr8(x)    (native_write_cr8(x))
+#define load_gs_index   native_load_gs_index
+#endif
+
+/* Clear the 'TS' bit */
+#define clts()          (native_clts())
+
+#endif/* CONFIG_PARAVIRT */
+
+#define stts() write_cr0(read_cr0() | X86_CR0_TS)
+
+#endif /* __KERNEL__ */
+
+static inline void clflush(volatile void *__p)
+{
+        asm volatile("clflush %0" : "+m" (*(volatile char __force *)__p));
+}
+
+#define nop() asm volatile ("nop")
+
+void disable_hlt(void);
+void enable_hlt(void);
+
+void cpu_idle_wait(void);
+
+extern unsigned long arch_align_stack(unsigned long sp);
+extern void free_init_pages(char *what, unsigned long begin, unsigned long end);
+
+void default_idle(void);
+
+/*
+ * Force strict CPU ordering.
+ * And yes, this is required on UP too when we're talking
+ * to devices.
+ */
+#ifdef CONFIG_X86_32
+/*
+ * Some non-Intel clones support out of order store. wmb() ceases to be a
+ * nop for these.
+ */
+#define mb() alternative("lock; addl $0,0(%%esp)", "mfence", X86_FEATURE_XMM2)
+#define rmb() alternative("lock; addl $0,0(%%esp)", "lfence", X86_FEATURE_XMM2)
+#define wmb() alternative("lock; addl $0,0(%%esp)", "sfence", X86_FEATURE_XMM)
+#else
+#define mb()    asm volatile("mfence":::"memory")
+#define rmb()   asm volatile("lfence":::"memory")
+#define wmb()   asm volatile("sfence" ::: "memory")
+#endif
+
+/**
+ * read_barrier_depends - Flush all pending reads that subsequents reads
+ * depend on.
+ *
+ * No data-dependent reads from memory-like regions are ever reordered
+ * over this barrier.  All reads preceding this primitive are guaranteed
+ * to access memory (but not necessarily other CPUs' caches) before any
+ * reads following this primitive that depend on the data return by
+ * any of the preceding reads.  This primitive is much lighter weight than
+ * rmb() on most CPUs, and is never heavier weight than is
+ * rmb().
+ *
+ * These ordering constraints are respected by both the local CPU
+ * and the compiler.
+ *
+ * Ordering is not guaranteed by anything other than these primitives,
+ * not even by data dependencies.  See the documentation for
+ * memory_barrier() for examples and URLs to more information.
+ *
+ * For example, the following code would force ordering (the initial
+ * value of "a" is zero, "b" is one, and "p" is "&a"):
+ *
+ * <programlisting>
+ *      CPU 0                           CPU 1
+ *
+ *      b = 2;
+ *      memory_barrier();
+ *      p = &b;                         q = p;
+ *                                      read_barrier_depends();
+ *                                      d = *q;
+ * </programlisting>
+ *
+ * because the read of "*q" depends on the read of "p" and these
+ * two reads are separated by a read_barrier_depends().  However,
+ * the following code, with the same initial values for "a" and "b":
+ *
+ * <programlisting>
+ *      CPU 0                           CPU 1
+ *
+ *      a = 2;
+ *      memory_barrier();
+ *      b = 3;                          y = b;
+ *                                      read_barrier_depends();
+ *                                      x = a;
+ * </programlisting>
+ *
+ * does not enforce ordering, since there is no data dependency between
+ * the read of "a" and the read of "b".  Therefore, on some CPUs, such
+ * as Alpha, "y" could be set to 3 and "x" to 0.  Use rmb()
+ * in cases like this where there are no data dependencies.
+ **/
+
+#define read_barrier_depends()  do { } while (0)
+
+#ifdef CONFIG_SMP
+#define smp_mb()        mb()
+#ifdef CONFIG_X86_PPRO_FENCE
+# define smp_rmb()      rmb()
+#else
+# define smp_rmb()      barrier()
+#endif
+#ifdef CONFIG_X86_OOSTORE
+# define smp_wmb()      wmb()
+#else
+# define smp_wmb()      barrier()
+#endif
+#define smp_read_barrier_depends()      read_barrier_depends()
+#define set_mb(var, value) do { (void)xchg(&var, value); } while (0)
+#else
+#define smp_mb()        barrier()
+#define smp_rmb()       barrier()
+#define smp_wmb()       barrier()
+#define smp_read_barrier_depends()      do { } while (0)
+#define set_mb(var, value) do { var = value; barrier(); } while (0)
+#endif
+
+/*
+ * Stop RDTSC speculation. This is needed when you need to use RDTSC
+ * (or get_cycles or vread that possibly accesses the TSC) in a defined
+ * code region.
+ *
+ * (Could use an alternative three way for this if there was one.)
+ */
+static inline void rdtsc_barrier(void)
+{
+        alternative(ASM_NOP3, "mfence", X86_FEATURE_MFENCE_RDTSC);
+        alternative(ASM_NOP3, "lfence", X86_FEATURE_LFENCE_RDTSC);
+}
+
+#endif /* ASM_X86__SYSTEM_H */