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-rw-r--r--arch/blackfin/mach-common/head.S306
1 files changed, 115 insertions, 191 deletions
diff --git a/arch/blackfin/mach-common/head.S b/arch/blackfin/mach-common/head.S
index f123a62e245..31515f0146f 100644
--- a/arch/blackfin/mach-common/head.S
+++ b/arch/blackfin/mach-common/head.S
@@ -3,8 +3,6 @@
*
* Copyright 2004-2008 Analog Devices Inc.
*
- * Enter bugs at http://blackfin.uclinux.org/
- *
* Licensed under the GPL-2 or later.
*/
@@ -13,14 +11,27 @@
#include <asm/blackfin.h>
#include <asm/thread_info.h>
#include <asm/trace.h>
+#include <asm/asm-offsets.h>
__INIT
-#define INITIAL_STACK (L1_SCRATCH_START + L1_SCRATCH_LENGTH - 12)
+ENTRY(__init_clear_bss)
+ r2 = r2 - r1;
+ cc = r2 == 0;
+ if cc jump .L_bss_done;
+ r2 >>= 2;
+ p1 = r1;
+ p2 = r2;
+ lsetup (1f, 1f) lc0 = p2;
+1: [p1++] = r0;
+.L_bss_done:
+ rts;
+ENDPROC(__init_clear_bss)
ENTRY(__start)
/* R0: argument of command line string, passed from uboot, save it */
R7 = R0;
+
/* Enable Cycle Counter and Nesting Of Interrupts */
#ifdef CONFIG_BFIN_SCRATCH_REG_CYCLES
R0 = SYSCFG_SNEN;
@@ -28,132 +39,130 @@ ENTRY(__start)
R0 = SYSCFG_SNEN | SYSCFG_CCEN;
#endif
SYSCFG = R0;
- R0 = 0;
- /* Clear Out All the data and pointer Registers */
- R1 = R0;
- R2 = R0;
- R3 = R0;
- R4 = R0;
- R5 = R0;
- R6 = R0;
-
- P0 = R0;
- P1 = R0;
- P2 = R0;
- P3 = R0;
- P4 = R0;
- P5 = R0;
-
- LC0 = r0;
- LC1 = r0;
- L0 = r0;
- L1 = r0;
- L2 = r0;
- L3 = r0;
+ /* Optimization register tricks: keep a base value in the
+ * reserved P registers so we use the load/store with an
+ * offset syntax. R0 = [P5 + <constant>];
+ * P5 - core MMR base
+ * R6 - 0
+ */
+ r6 = 0;
+ p5.l = 0;
+ p5.h = hi(COREMMR_BASE);
- /* Clear Out All the DAG Registers */
- B0 = r0;
- B1 = r0;
- B2 = r0;
- B3 = r0;
+ /* Zero out registers required by Blackfin ABI */
- I0 = r0;
- I1 = r0;
- I2 = r0;
- I3 = r0;
+ /* Disable circular buffers */
+ L0 = r6;
+ L1 = r6;
+ L2 = r6;
+ L3 = r6;
- M0 = r0;
- M1 = r0;
- M2 = r0;
- M3 = r0;
+ /* Disable hardware loops in case we were started by 'go' */
+ LC0 = r6;
+ LC1 = r6;
/*
* Clear ITEST_COMMAND and DTEST_COMMAND registers,
* Leaving these as non-zero can confuse the emulator
*/
- p0.L = LO(DTEST_COMMAND);
- p0.H = HI(DTEST_COMMAND);
- [p0] = R0;
- [p0 + (ITEST_COMMAND - DTEST_COMMAND)] = R0;
+ [p5 + (DTEST_COMMAND - COREMMR_BASE)] = r6;
+ [p5 + (ITEST_COMMAND - COREMMR_BASE)] = r6;
CSYNC;
trace_buffer_init(p0,r0);
- P0 = R1;
- R0 = R1;
/* Turn off the icache */
- p0.l = LO(IMEM_CONTROL);
- p0.h = HI(IMEM_CONTROL);
- R1 = [p0];
- R0 = ~ENICPLB;
- R0 = R0 & R1;
- [p0] = R0;
+ r1 = [p5 + (IMEM_CONTROL - COREMMR_BASE)];
+ BITCLR (r1, ENICPLB_P);
+ [p5 + (IMEM_CONTROL - COREMMR_BASE)] = r1;
SSYNC;
/* Turn off the dcache */
- p0.l = LO(DMEM_CONTROL);
- p0.h = HI(DMEM_CONTROL);
- R1 = [p0];
- R0 = ~ENDCPLB;
- R0 = R0 & R1;
- [p0] = R0;
+ r1 = [p5 + (DMEM_CONTROL - COREMMR_BASE)];
+ BITCLR (r1, ENDCPLB_P);
+ [p5 + (DMEM_CONTROL - COREMMR_BASE)] = r1;
SSYNC;
/* in case of double faults, save a few things */
- p0.l = _init_retx;
- p0.h = _init_retx;
- R0 = RETX;
- [P0] = R0;
-
+ p1.l = _initial_pda;
+ p1.h = _initial_pda;
+ r4 = RETX;
#ifdef CONFIG_DEBUG_DOUBLEFAULT
/* Only save these if we are storing them,
* This happens here, since L1 gets clobbered
* below
*/
- p0.l = _saved_retx;
- p0.h = _saved_retx;
- p1.l = _init_saved_retx;
- p1.h = _init_saved_retx;
- r0 = [p0];
- [p1] = r0;
-
- p0.l = _saved_dcplb_fault_addr;
- p0.h = _saved_dcplb_fault_addr;
- p1.l = _init_saved_dcplb_fault_addr;
- p1.h = _init_saved_dcplb_fault_addr;
- r0 = [p0];
- [p1] = r0;
-
- p0.l = _saved_icplb_fault_addr;
- p0.h = _saved_icplb_fault_addr;
- p1.l = _init_saved_icplb_fault_addr;
- p1.h = _init_saved_icplb_fault_addr;
- r0 = [p0];
- [p1] = r0;
-
- p0.l = _saved_seqstat;
- p0.h = _saved_seqstat;
- p1.l = _init_saved_seqstat;
- p1.h = _init_saved_seqstat;
- r0 = [p0];
- [p1] = r0;
+ GET_PDA(p0, r0);
+ r0 = [p0 + PDA_DF_RETX];
+ r1 = [p0 + PDA_DF_DCPLB];
+ r2 = [p0 + PDA_DF_ICPLB];
+ r3 = [p0 + PDA_DF_SEQSTAT];
+ [p1 + PDA_INIT_DF_RETX] = r0;
+ [p1 + PDA_INIT_DF_DCPLB] = r1;
+ [p1 + PDA_INIT_DF_ICPLB] = r2;
+ [p1 + PDA_INIT_DF_SEQSTAT] = r3;
#endif
+ [p1 + PDA_INIT_RETX] = r4;
/* Initialize stack pointer */
- sp.l = lo(INITIAL_STACK);
- sp.h = hi(INITIAL_STACK);
+ sp.l = _init_thread_union + THREAD_SIZE;
+ sp.h = _init_thread_union + THREAD_SIZE;
fp = sp;
usp = sp;
#ifdef CONFIG_EARLY_PRINTK
call _init_early_exception_vectors;
+ r0 = (EVT_IVHW | EVT_IRPTEN | EVT_EVX | EVT_NMI | EVT_RST | EVT_EMU);
+ sti r0;
#endif
+ r0 = r6;
+ /* Zero out all of the fun bss regions */
+#if L1_DATA_A_LENGTH > 0
+ r1.l = __sbss_l1;
+ r1.h = __sbss_l1;
+ r2.l = __ebss_l1;
+ r2.h = __ebss_l1;
+ call __init_clear_bss
+#endif
+#if L1_DATA_B_LENGTH > 0
+ r1.l = __sbss_b_l1;
+ r1.h = __sbss_b_l1;
+ r2.l = __ebss_b_l1;
+ r2.h = __ebss_b_l1;
+ call __init_clear_bss
+#endif
+#if L2_LENGTH > 0
+ r1.l = __sbss_l2;
+ r1.h = __sbss_l2;
+ r2.l = __ebss_l2;
+ r2.h = __ebss_l2;
+ call __init_clear_bss
+#endif
+ r1.l = ___bss_start;
+ r1.h = ___bss_start;
+ r2.l = ___bss_stop;
+ r2.h = ___bss_stop;
+ call __init_clear_bss
+
/* Put The Code for PLL Programming and SDRAM Programming in L1 ISRAM */
call _bfin_relocate_l1_mem;
+
+#ifdef CONFIG_ROMKERNEL
+ call _bfin_relocate_xip_data;
+#endif
+
#ifdef CONFIG_BFIN_KERNEL_CLOCK
- call _start_dma_code;
+ /* Only use on-chip scratch space for stack when absolutely required
+ * to avoid Anomaly 05000227 ... we know the init_clocks() func only
+ * uses L1 text and stack space and no other memory region.
+ */
+# define KERNEL_CLOCK_STACK (L1_SCRATCH_START + L1_SCRATCH_LENGTH - 12)
+ sp.l = lo(KERNEL_CLOCK_STACK);
+ sp.h = hi(KERNEL_CLOCK_STACK);
+ call _init_clocks;
+ sp = usp; /* usp hasn't been touched, so restore from there */
#endif
/* This section keeps the processor in supervisor mode
@@ -163,23 +172,26 @@ ENTRY(__start)
/* EVT15 = _real_start */
- p0.l = lo(EVT15);
- p0.h = hi(EVT15);
p1.l = _real_start;
p1.h = _real_start;
- [p0] = p1;
+ [p5 + (EVT15 - COREMMR_BASE)] = p1;
csync;
- p0.l = lo(IMASK);
- p0.h = hi(IMASK);
- p1.l = IMASK_IVG15;
- p1.h = 0x0;
- [p0] = p1;
- csync;
+#ifdef CONFIG_EARLY_PRINTK
+ r0 = (EVT_IVG15 | EVT_IVHW | EVT_IRPTEN | EVT_EVX | EVT_NMI | EVT_RST | EVT_EMU) (z);
+#else
+ r0 = EVT_IVG15 (z);
+#endif
+ sti r0;
raise 15;
+#ifdef CONFIG_EARLY_PRINTK
+ p0.l = _early_trap;
+ p0.h = _early_trap;
+#else
p0.l = .LWAIT_HERE;
p0.h = .LWAIT_HERE;
+#endif
reti = p0;
#if ANOMALY_05000281
nop; nop; nop;
@@ -198,107 +210,19 @@ ENDPROC(__start)
ENTRY(_real_start)
/* Enable nested interrupts */
[--sp] = reti;
-
/* watchdog off for now */
p0.l = lo(WDOG_CTL);
p0.h = hi(WDOG_CTL);
r0 = 0xAD6(z);
w[p0] = r0;
ssync;
-
-#if L1_DATA_A_LENGTH > 0
- r1.l = __sbss_l1;
- r1.h = __sbss_l1;
- r2.l = __ebss_l1;
- r2.h = __ebss_l1;
- r0 = 0 (z);
- r2 = r2 - r1;
- cc = r2 == 0;
- if cc jump .L_a_l1_done;
- r2 >>= 2;
- p1 = r1;
- p2 = r2;
- lsetup (.L_clear_a_l1, .L_clear_a_l1 ) lc0 = p2;
-.L_clear_a_l1:
- [p1++] = r0;
-.L_a_l1_done:
-#endif
-
-#if L1_DATA_B_LENGTH > 0
- r1.l = __sbss_b_l1;
- r1.h = __sbss_b_l1;
- r2.l = __ebss_b_l1;
- r2.h = __ebss_b_l1;
- r0 = 0 (z);
- r2 = r2 - r1;
- cc = r2 == 0;
- if cc jump .L_b_l1_done;
- r2 >>= 2;
- p1 = r1;
- p2 = r2;
- lsetup (.L_clear_b_l1, .L_clear_b_l1 ) lc0 = p2;
-.L_clear_b_l1:
- [p1++] = r0;
-.L_b_l1_done:
-#endif
-
-#if L2_LENGTH > 0
- r1.l = __sbss_l2;
- r1.h = __sbss_l2;
- r2.l = __ebss_l2;
- r2.h = __ebss_l2;
- r0 = 0 (z);
- r2 = r2 - r1;
- cc = r2 == 0;
- if cc jump .L_l2_done;
- r2 >>= 2;
- p1 = r1;
- p2 = r2;
- lsetup (.L_clear_l2, .L_clear_l2 ) lc0 = p2;
-.L_clear_l2:
- [p1++] = r0;
-.L_l2_done:
-#endif
-
- /* Zero out the bss region
- * Note: this will fail if bss is 0 bytes ...
- */
- r0 = 0 (z);
- r1.l = ___bss_start;
- r1.h = ___bss_start;
- r2.l = ___bss_stop;
- r2.h = ___bss_stop;
- r2 = r2 - r1;
- r2 >>= 2;
- p1 = r1;
- p2 = r2;
- lsetup (.L_clear_bss, .L_clear_bss) lc0 = p2;
-.L_clear_bss:
- [p1++] = r0;
-
- /* In case there is a NULL pointer reference,
- * zero out region before stext
- */
- p1 = r0;
- r2.l = __stext;
- r2.h = __stext;
- r2 >>= 2;
- p2 = r2;
- lsetup (.L_clear_zero, .L_clear_zero) lc0 = p2;
-.L_clear_zero:
- [p1++] = r0;
-
/* Pass the u-boot arguments to the global value command line */
R0 = R7;
call _cmdline_init;
- /* Load the current thread pointer and stack */
- sp.l = _init_thread_union;
- sp.h = _init_thread_union;
- p1 = THREAD_SIZE (z);
- sp = sp + p1;
- usp = sp;
- fp = sp;
+ sp += -12 + 4; /* +4 is for reti loading above */
+ call _init_pda
+ sp += 12;
jump.l _start_kernel;
ENDPROC(_real_start)
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