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authorMike Frysinger <vapier@gentoo.org>2011-05-29 16:05:03 -0400
committerMike Frysinger <vapier@gentoo.org>2011-07-23 01:10:42 -0400
commitb648072d3ef5d68cc9fa392dae19f8adc82231b7 (patch)
tree6447f40520b2797a83de9b7d9b90d700b87dcb06 /arch/blackfin
parent2f7d63f909900c555baf36a4c6a11e9bf8e1af18 (diff)
downloadop-kernel-dev-b648072d3ef5d68cc9fa392dae19f8adc82231b7.zip
op-kernel-dev-b648072d3ef5d68cc9fa392dae19f8adc82231b7.tar.gz
Blackfin: SMP: optimize start up code a bit
This just imports all of the optimization work done in the common startup code. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch/blackfin')
-rw-r--r--arch/blackfin/mach-bf561/secondary.S132
1 files changed, 54 insertions, 78 deletions
diff --git a/arch/blackfin/mach-bf561/secondary.S b/arch/blackfin/mach-bf561/secondary.S
index 4c46283..348c919 100644
--- a/arch/blackfin/mach-bf561/secondary.S
+++ b/arch/blackfin/mach-bf561/secondary.S
@@ -23,74 +23,56 @@
#define INITIAL_STACK (COREB_L1_SCRATCH_START + L1_SCRATCH_LENGTH - 12)
ENTRY(_coreb_trampoline_start)
- /* Set the SYSCFG register */
- R0 = 0x36;
- SYSCFG = R0; /*Enable Cycle Counter and Nesting Of Interrupts(3rd Bit)*/
- R0 = 0;
-
- /*Clear Out All the data and pointer Registers*/
- R1 = R0;
- R2 = R0;
- R3 = R0;
- R4 = R0;
- R5 = R0;
- R6 = R0;
- R7 = 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;
-
- /* Clear Out All the DAG Registers*/
- B0 = r0;
- B1 = r0;
- B2 = r0;
- B3 = r0;
-
- I0 = r0;
- I1 = r0;
- I2 = r0;
- I3 = r0;
-
- M0 = r0;
- M1 = r0;
- M2 = r0;
- M3 = r0;
+ /* Enable Cycle Counter and Nesting Of Interrupts */
+#ifdef CONFIG_BFIN_SCRATCH_REG_CYCLES
+ R0 = SYSCFG_SNEN;
+#else
+ R0 = SYSCFG_SNEN | SYSCFG_CCEN;
+#endif
+ SYSCFG = R0;
- trace_buffer_init(p0,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);
- /* Turn off the icache */
- p0.l = LO(IMEM_CONTROL);
- p0.h = HI(IMEM_CONTROL);
- R1 = [p0];
- R0 = ~ENICPLB;
- R0 = R0 & R1;
+ /* Zero out registers required by Blackfin ABI */
- /* Disabling of CPLBs should be proceeded by a CSYNC */
+ /* Disable circular buffers */
+ L0 = r6;
+ L1 = r6;
+ L2 = r6;
+ L3 = r6;
+
+ /* 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
+ */
+ [p5 + (DTEST_COMMAND - COREMMR_BASE)] = r6;
+ [p5 + (ITEST_COMMAND - COREMMR_BASE)] = r6;
CSYNC;
- [p0] = R0;
+
+ trace_buffer_init(p0,r0);
+
+ /* Turn off the icache */
+ 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;
-
- /* Disabling of CPLBs should be proceeded by a CSYNC */
- CSYNC;
- [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 */
@@ -105,25 +87,25 @@ ENTRY(_coreb_trampoline_start)
* below
*/
GET_PDA(p0, r0);
- r7 = [p0 + PDA_DF_RETX];
+ r5 = [p0 + PDA_DF_RETX];
p1.l = _init_saved_retx_coreb;
p1.h = _init_saved_retx_coreb;
- [p1] = r7;
+ [p1] = r5;
- r7 = [p0 + PDA_DF_DCPLB];
+ r5 = [p0 + PDA_DF_DCPLB];
p1.l = _init_saved_dcplb_fault_addr_coreb;
p1.h = _init_saved_dcplb_fault_addr_coreb;
- [p1] = r7;
+ [p1] = r5;
- r7 = [p0 + PDA_DF_ICPLB];
+ r5 = [p0 + PDA_DF_ICPLB];
p1.l = _init_saved_icplb_fault_addr_coreb;
p1.h = _init_saved_icplb_fault_addr_coreb;
- [p1] = r7;
+ [p1] = r5;
- r7 = [p0 + PDA_DF_SEQSTAT];
+ r5 = [p0 + PDA_DF_SEQSTAT];
p1.l = _init_saved_seqstat_coreb;
p1.h = _init_saved_seqstat_coreb;
- [p1] = r7;
+ [p1] = r5;
#endif
/* Initialize stack pointer */
@@ -138,19 +120,13 @@ ENTRY(_coreb_trampoline_start)
/* EVT15 = _real_start */
- p0.l = lo(EVT15);
- p0.h = hi(EVT15);
p1.l = _coreb_start;
p1.h = _coreb_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;
+ r0 = EVT_IVG15 (z);
+ sti r0;
raise 15;
p0.l = .LWAIT_HERE;
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