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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-17 02:20:36 +0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-17 02:20:36 +0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/asm-sparc/system.h
downloadlinux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'include/asm-sparc/system.h')
-rw-r--r--include/asm-sparc/system.h262
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diff --git a/include/asm-sparc/system.h b/include/asm-sparc/system.h
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+++ b/include/asm-sparc/system.h
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+/* $Id: system.h,v 1.86 2001/10/30 04:57:10 davem Exp $ */
+#include <linux/config.h>
+
+#ifndef __SPARC_SYSTEM_H
+#define __SPARC_SYSTEM_H
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/threads.h> /* NR_CPUS */
+#include <linux/thread_info.h>
+
+#include <asm/segment.h>
+#include <asm/page.h>
+#include <asm/psr.h>
+#include <asm/ptrace.h>
+#include <asm/btfixup.h>
+
+#ifndef __ASSEMBLY__
+
+/*
+ * Sparc (general) CPU types
+ */
+enum sparc_cpu {
+ sun4 = 0x00,
+ sun4c = 0x01,
+ sun4m = 0x02,
+ sun4d = 0x03,
+ sun4e = 0x04,
+ sun4u = 0x05, /* V8 ploos ploos */
+ sun_unknown = 0x06,
+ ap1000 = 0x07, /* almost a sun4m */
+};
+
+/* Really, userland should not be looking at any of this... */
+#ifdef __KERNEL__
+
+extern enum sparc_cpu sparc_cpu_model;
+
+#ifndef CONFIG_SUN4
+#define ARCH_SUN4C_SUN4 (sparc_cpu_model==sun4c)
+#define ARCH_SUN4 0
+#else
+#define ARCH_SUN4C_SUN4 1
+#define ARCH_SUN4 1
+#endif
+
+#define SUN4M_NCPUS 4 /* Architectural limit of sun4m. */
+
+extern struct thread_info *current_set[NR_CPUS];
+
+extern unsigned long empty_bad_page;
+extern unsigned long empty_bad_page_table;
+extern unsigned long empty_zero_page;
+
+extern void sun_do_break(void);
+extern int serial_console;
+extern int stop_a_enabled;
+
+static __inline__ int con_is_present(void)
+{
+ return serial_console ? 0 : 1;
+}
+
+/* When a context switch happens we must flush all user windows so that
+ * the windows of the current process are flushed onto its stack. This
+ * way the windows are all clean for the next process and the stack
+ * frames are up to date.
+ */
+extern void flush_user_windows(void);
+extern void kill_user_windows(void);
+extern void synchronize_user_stack(void);
+extern void fpsave(unsigned long *fpregs, unsigned long *fsr,
+ void *fpqueue, unsigned long *fpqdepth);
+
+#ifdef CONFIG_SMP
+#define SWITCH_ENTER(prv) \
+ do { \
+ if (test_tsk_thread_flag(prv, TIF_USEDFPU)) { \
+ put_psr(get_psr() | PSR_EF); \
+ fpsave(&(prv)->thread.float_regs[0], &(prv)->thread.fsr, \
+ &(prv)->thread.fpqueue[0], &(prv)->thread.fpqdepth); \
+ clear_tsk_thread_flag(prv, TIF_USEDFPU); \
+ (prv)->thread.kregs->psr &= ~PSR_EF; \
+ } \
+ } while(0)
+
+#define SWITCH_DO_LAZY_FPU(next) /* */
+#else
+#define SWITCH_ENTER(prv) /* */
+#define SWITCH_DO_LAZY_FPU(nxt) \
+ do { \
+ if (last_task_used_math != (nxt)) \
+ (nxt)->thread.kregs->psr&=~PSR_EF; \
+ } while(0)
+#endif
+
+/*
+ * Flush windows so that the VM switch which follows
+ * would not pull the stack from under us.
+ *
+ * SWITCH_ENTER and SWITH_DO_LAZY_FPU do not work yet (e.g. SMP does not work)
+ * XXX WTF is the above comment? Found in late teen 2.4.x.
+ */
+#define prepare_arch_switch(rq, next) do { \
+ __asm__ __volatile__( \
+ ".globl\tflush_patch_switch\nflush_patch_switch:\n\t" \
+ "save %sp, -0x40, %sp; save %sp, -0x40, %sp; save %sp, -0x40, %sp\n\t" \
+ "save %sp, -0x40, %sp; save %sp, -0x40, %sp; save %sp, -0x40, %sp\n\t" \
+ "save %sp, -0x40, %sp\n\t" \
+ "restore; restore; restore; restore; restore; restore; restore"); \
+} while(0)
+#define finish_arch_switch(rq, next) spin_unlock_irq(&(rq)->lock)
+#define task_running(rq, p) ((rq)->curr == (p))
+
+ /* Much care has gone into this code, do not touch it.
+ *
+ * We need to loadup regs l0/l1 for the newly forked child
+ * case because the trap return path relies on those registers
+ * holding certain values, gcc is told that they are clobbered.
+ * Gcc needs registers for 3 values in and 1 value out, so we
+ * clobber every non-fixed-usage register besides l2/l3/o4/o5. -DaveM
+ *
+ * Hey Dave, that do not touch sign is too much of an incentive
+ * - Anton & Pete
+ */
+#define switch_to(prev, next, last) do { \
+ SWITCH_ENTER(prev); \
+ SWITCH_DO_LAZY_FPU(next); \
+ cpu_set(smp_processor_id(), next->active_mm->cpu_vm_mask); \
+ __asm__ __volatile__( \
+ "sethi %%hi(here - 0x8), %%o7\n\t" \
+ "mov %%g6, %%g3\n\t" \
+ "or %%o7, %%lo(here - 0x8), %%o7\n\t" \
+ "rd %%psr, %%g4\n\t" \
+ "std %%sp, [%%g6 + %4]\n\t" \
+ "rd %%wim, %%g5\n\t" \
+ "wr %%g4, 0x20, %%psr\n\t" \
+ "nop\n\t" \
+ "std %%g4, [%%g6 + %3]\n\t" \
+ "ldd [%2 + %3], %%g4\n\t" \
+ "mov %2, %%g6\n\t" \
+ ".globl patchme_store_new_current\n" \
+"patchme_store_new_current:\n\t" \
+ "st %2, [%1]\n\t" \
+ "wr %%g4, 0x20, %%psr\n\t" \
+ "nop\n\t" \
+ "nop\n\t" \
+ "nop\n\t" /* LEON needs all 3 nops: load to %sp depends on CWP. */ \
+ "ldd [%%g6 + %4], %%sp\n\t" \
+ "wr %%g5, 0x0, %%wim\n\t" \
+ "ldd [%%sp + 0x00], %%l0\n\t" \
+ "ldd [%%sp + 0x38], %%i6\n\t" \
+ "wr %%g4, 0x0, %%psr\n\t" \
+ "nop\n\t" \
+ "nop\n\t" \
+ "jmpl %%o7 + 0x8, %%g0\n\t" \
+ " ld [%%g3 + %5], %0\n\t" \
+ "here:\n" \
+ : "=&r" (last) \
+ : "r" (&(current_set[hard_smp_processor_id()])), \
+ "r" ((next)->thread_info), \
+ "i" (TI_KPSR), \
+ "i" (TI_KSP), \
+ "i" (TI_TASK) \
+ : "g1", "g2", "g3", "g4", "g5", "g7", \
+ "l0", "l1", "l3", "l4", "l5", "l6", "l7", \
+ "i0", "i1", "i2", "i3", "i4", "i5", \
+ "o0", "o1", "o2", "o3", "o7"); \
+ } while(0)
+
+/*
+ * Changing the IRQ level on the Sparc.
+ */
+extern void local_irq_restore(unsigned long);
+extern unsigned long __local_irq_save(void);
+extern void local_irq_enable(void);
+
+static inline unsigned long getipl(void)
+{
+ unsigned long retval;
+
+ __asm__ __volatile__("rd %%psr, %0" : "=r" (retval));
+ return retval;
+}
+
+#define local_save_flags(flags) ((flags) = getipl())
+#define local_irq_save(flags) ((flags) = __local_irq_save())
+#define local_irq_disable() ((void) __local_irq_save())
+#define irqs_disabled() ((getipl() & PSR_PIL) != 0)
+
+/* XXX Change this if we ever use a PSO mode kernel. */
+#define mb() __asm__ __volatile__ ("" : : : "memory")
+#define rmb() mb()
+#define wmb() mb()
+#define read_barrier_depends() do { } while(0)
+#define set_mb(__var, __value) do { __var = __value; mb(); } while(0)
+#define set_wmb(__var, __value) set_mb(__var, __value)
+#define smp_mb() __asm__ __volatile__("":::"memory")
+#define smp_rmb() __asm__ __volatile__("":::"memory")
+#define smp_wmb() __asm__ __volatile__("":::"memory")
+#define smp_read_barrier_depends() do { } while(0)
+
+#define nop() __asm__ __volatile__ ("nop")
+
+/* This has special calling conventions */
+#ifndef CONFIG_SMP
+BTFIXUPDEF_CALL(void, ___xchg32, void)
+#endif
+
+extern __inline__ unsigned long xchg_u32(__volatile__ unsigned long *m, unsigned long val)
+{
+#ifdef CONFIG_SMP
+ __asm__ __volatile__("swap [%2], %0"
+ : "=&r" (val)
+ : "0" (val), "r" (m)
+ : "memory");
+ return val;
+#else
+ register unsigned long *ptr asm("g1");
+ register unsigned long ret asm("g2");
+
+ ptr = (unsigned long *) m;
+ ret = val;
+
+ /* Note: this is magic and the nop there is
+ really needed. */
+ __asm__ __volatile__(
+ "mov %%o7, %%g4\n\t"
+ "call ___f____xchg32\n\t"
+ " nop\n\t"
+ : "=&r" (ret)
+ : "0" (ret), "r" (ptr)
+ : "g3", "g4", "g7", "memory", "cc");
+
+ return ret;
+#endif
+}
+
+#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
+#define tas(ptr) (xchg((ptr),1))
+
+extern void __xchg_called_with_bad_pointer(void);
+
+static __inline__ unsigned long __xchg(unsigned long x, __volatile__ void * ptr, int size)
+{
+ switch (size) {
+ case 4:
+ return xchg_u32(ptr, x);
+ };
+ __xchg_called_with_bad_pointer();
+ return x;
+}
+
+extern void die_if_kernel(char *str, struct pt_regs *regs) __attribute__ ((noreturn));
+
+#endif /* __KERNEL__ */
+
+#endif /* __ASSEMBLY__ */
+
+#define arch_align_stack(x) (x)
+
+#endif /* !(__SPARC_SYSTEM_H) */