Linux-2.6.12-rc2v2.6.12-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!

1 files changed, 100 insertions, 0 deletions

diff --git a/arch/sparc/lib/atomic.S b/arch/sparc/lib/atomic.S
new file mode 100644
index 000000000000..f48ad0c4dadb
--- /dev/null
+++ b/arch/sparc/lib/atomic.S
@@ -0,0 +1,100 @@
+/* atomic.S: Move this stuff here for better ICACHE hit rates.
+ *
+ * Copyright (C) 1996 David S. Miller (davem@caipfs.rutgers.edu)
+ */
+
+#include <linux/config.h>
+#include <asm/ptrace.h>
+#include <asm/psr.h>
+
+        .text
+        .align  4
+
+        .globl  __atomic_begin
+__atomic_begin:
+
+#ifndef CONFIG_SMP
+        .globl  ___xchg32_sun4c
+___xchg32_sun4c:
+        rd      %psr, %g3
+        andcc   %g3, PSR_PIL, %g0
+        bne     1f
+         nop
+        wr      %g3, PSR_PIL, %psr
+        nop; nop; nop
+1:
+        andcc   %g3, PSR_PIL, %g0
+        ld      [%g1], %g7
+        bne     1f
+         st     %g2, [%g1]
+        wr      %g3, 0x0, %psr
+        nop; nop; nop
+1:
+        mov     %g7, %g2
+        jmpl    %o7 + 8, %g0
+         mov    %g4, %o7
+
+        .globl  ___xchg32_sun4md
+___xchg32_sun4md:
+        swap    [%g1], %g2
+        jmpl    %o7 + 8, %g0
+         mov    %g4, %o7
+#endif
+
+        /* Read asm-sparc/atomic.h carefully to understand how this works for SMP.
+         * Really, some things here for SMP are overly clever, go read the header.
+         */
+        .globl  ___atomic24_add
+___atomic24_add:
+        rd      %psr, %g3               ! Keep the code small, old way was stupid
+        nop; nop; nop;                  ! Let the bits set
+        or      %g3, PSR_PIL, %g7       ! Disable interrupts
+        wr      %g7, 0x0, %psr          ! Set %psr
+        nop; nop; nop;                  ! Let the bits set
+#ifdef CONFIG_SMP
+1:      ldstub  [%g1 + 3], %g7          ! Spin on the byte lock for SMP.
+        orcc    %g7, 0x0, %g0           ! Did we get it?
+        bne     1b                      ! Nope...
+         ld     [%g1], %g7              ! Load locked atomic24_t
+        sra     %g7, 8, %g7             ! Get signed 24-bit integer
+        add     %g7, %g2, %g2           ! Add in argument
+        sll     %g2, 8, %g7             ! Transpose back to atomic24_t
+        st      %g7, [%g1]              ! Clever: This releases the lock as well.
+#else
+        ld      [%g1], %g7              ! Load locked atomic24_t
+        add     %g7, %g2, %g2           ! Add in argument
+        st      %g2, [%g1]              ! Store it back
+#endif
+        wr      %g3, 0x0, %psr          ! Restore original PSR_PIL
+        nop; nop; nop;                  ! Let the bits set
+        jmpl    %o7, %g0                ! NOTE: not + 8, see callers in atomic.h
+         mov    %g4, %o7                ! Restore %o7
+
+        .globl  ___atomic24_sub
+___atomic24_sub:
+        rd      %psr, %g3               ! Keep the code small, old way was stupid
+        nop; nop; nop;                  ! Let the bits set
+        or      %g3, PSR_PIL, %g7       ! Disable interrupts
+        wr      %g7, 0x0, %psr          ! Set %psr
+        nop; nop; nop;                  ! Let the bits set
+#ifdef CONFIG_SMP
+1:      ldstub  [%g1 + 3], %g7          ! Spin on the byte lock for SMP.
+        orcc    %g7, 0x0, %g0           ! Did we get it?
+        bne     1b                      ! Nope...
+         ld     [%g1], %g7              ! Load locked atomic24_t
+        sra     %g7, 8, %g7             ! Get signed 24-bit integer
+        sub     %g7, %g2, %g2           ! Subtract argument
+        sll     %g2, 8, %g7             ! Transpose back to atomic24_t
+        st      %g7, [%g1]              ! Clever: This releases the lock as well
+#else
+        ld      [%g1], %g7              ! Load locked atomic24_t
+        sub     %g7, %g2, %g2           ! Subtract argument
+        st      %g2, [%g1]              ! Store it back
+#endif
+        wr      %g3, 0x0, %psr          ! Restore original PSR_PIL
+        nop; nop; nop;                  ! Let the bits set
+        jmpl    %o7, %g0                ! NOTE: not + 8, see callers in atomic.h
+         mov    %g4, %o7                ! Restore %o7
+
+        .globl  __atomic_end
+__atomic_end: