[coldfire]: 2.6.31 support (WiP)

[openwrt.git] / target / linux / coldfire / files-2.6.31 / arch / m68k / include / asm / cf_entry.h

diff --git a/target/linux/coldfire/files-2.6.31/arch/m68k/include/asm/cf_entry.h b/target/linux/coldfire/files-2.6.31/arch/m68k/include/asm/cf_entry.h
new file mode 100644 (file)
index 0000000..c8f37a4
--- /dev/null
+++ b/target/linux/coldfire/files-2.6.31/arch/m68k/include/asm/cf_entry.h
@@ -0,0 +1,146 @@
+#ifndef __CF_M68K_ENTRY_H
+#define __CF_M68K_ENTRY_H
+
+#include <asm/setup.h>
+#include <asm/page.h>
+#include <asm/coldfire.h>
+#include <asm/cfmmu.h>
+#include <asm/asm-offsets.h>
+
+/*
+ * Stack layout in 'ret_from_exception':
+ *
+ *     This allows access to the syscall arguments in registers d1-d5
+ *
+ *      0(sp) - d1
+ *      4(sp) - d2
+ *      8(sp) - d3
+ *      C(sp) - d4
+ *     10(sp) - d5
+ *     14(sp) - a0
+ *     18(sp) - a1
+ *     1C(sp) - a2
+ *     20(sp) - d0
+ *     24(sp) - orig_d0
+ *     28(sp) - stack adjustment
+ *     2C(sp) - sr
+ *     2E(sp) - pc
+ *     32(sp) - format & vector
+ *     36(sp) - MMUSR
+ *     3A(sp) - MMUAR
+ */
+
+/*
+ * 97/05/14 Andreas: Register %a2 is now set to the current task throughout
+ *                  the whole kernel.
+ */
+
+/* the following macro is used when enabling interrupts */
+/* portable version */
+#define ALLOWINT       (~0x700)
+#define        MAX_NOINT_IPL   0
+
+#ifdef __ASSEMBLY__
+
+#define curptr a2
+
+LFLUSH_I_AND_D = 0x00000808
+LSIGTRAP = 5
+
+/* process bits for task_struct.ptrace */
+PT_TRACESYS_OFF = 3
+PT_TRACESYS_BIT = 1
+PT_PTRACED_OFF = 3
+PT_PTRACED_BIT = 0
+PT_DTRACE_OFF = 3
+PT_DTRACE_BIT = 2
+
+#define SAVE_ALL_INT save_all_int
+#define SAVE_ALL_SYS save_all_sys
+#define RESTORE_ALL restore_all
+/*
+ * This defines the normal kernel pt-regs layout.
+ *
+ * regs a3-a6 and d6-d7 are preserved by C code
+ * the kernel doesn't mess with usp unless it needs to
+ */
+
+/*
+ * a -1 in the orig_d0 field signifies
+ * that the stack frame is NOT for syscall
+ */
+.macro save_all_int
+       movel   MMUSR,%sp@-
+       movel   MMUAR,%sp@-
+       clrl    %sp@-           | stk_adj
+       pea     -1:w            | orig d0
+       movel   %d0,%sp@-       | d0
+       subal   #(8*4), %sp
+       moveml  %d1-%d5/%a0-%a1/%curptr,%sp@
+.endm
+
+.macro save_all_sys
+       movel   MMUSR,%sp@-
+       movel   MMUAR,%sp@-
+       clrl    %sp@-           | stk_adj
+       movel   %d0,%sp@-       | orig d0
+       movel   %d0,%sp@-       | d0
+       subal   #(8*4), %sp
+       moveml  %d1-%d5/%a0-%a1/%curptr,%sp@
+.endm
+
+.macro restore_all
+       moveml  %sp@,%a0-%a1/%curptr/%d1-%d5
+       addal   #(8*4), %sp
+       movel   %sp@+,%d0       | d0
+       addql   #4,%sp          | orig d0
+       addl    %sp@+,%sp       | stk_adj
+       addql   #8,%sp          | MMUAR & MMUSR
+       rte
+.endm
+
+#define SWITCH_STACK_SIZE (6*4+4)      /* includes return address */
+
+#define SAVE_SWITCH_STACK save_switch_stack
+#define RESTORE_SWITCH_STACK restore_switch_stack
+#define GET_CURRENT(tmp) get_current tmp
+
+.macro save_switch_stack
+       subal   #(6*4), %sp
+       moveml  %a3-%a6/%d6-%d7,%sp@
+.endm
+
+.macro restore_switch_stack
+       moveml  %sp@,%a3-%a6/%d6-%d7
+       addal   #(6*4), %sp
+.endm
+
+.macro get_current reg=%d0
+       movel   %sp,\reg
+       andl    #-THREAD_SIZE,\reg
+       movel   \reg,%curptr
+       movel   %curptr@,%curptr
+.endm
+
+#else /* C source */
+
+#define STR(X) STR1(X)
+#define STR1(X) #X
+
+#define PT_OFF_ORIG_D0  0x24
+#define PT_OFF_FORMATVEC 0x32
+#define PT_OFF_SR       0x2C
+#define SAVE_ALL_INT                           \
+       "clrl   %%sp@-;"    /* stk_adj */       \
+       "pea    -1:w;"      /* orig d0 = -1 */  \
+       "movel  %%d0,%%sp@-;" /* d0 */          \
+       "subal  #(8*4),%sp"                     \
+       "moveml %%d1-%%d5/%%a0-%%a2,%%sp@"
+#define GET_CURRENT(tmp) \
+       "movel  %%sp,"#tmp"\n\t" \
+       "andw   #-"STR(THREAD_SIZE)","#tmp"\n\t" \
+       "movel  "#tmp",%%a2\n\t"
+
+#endif
+
+#endif /* __CF_M68K_ENTRY_H */