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author(no author) <(no author)@6dc7ffe9-61d6-0310-9af1-9938baff3ed1>2006-08-25 20:26:06 +0000
committer(no author) <(no author)@6dc7ffe9-61d6-0310-9af1-9938baff3ed1>2006-08-25 20:26:06 +0000
commit00882453806de7b5e924d140c5918015d54e1a5c (patch)
treeb541db2a535675b939e483f0be529feb1aeec07c /openpcd/firmware/src/start/Cstartup.S
parent0a0308858b8883ce51a01b9ece7cbb0ef19557bf (diff)
- use exception vector handlers in RAM rather ROM (required for DFU to work)
git-svn-id: https://svn.openpcd.org:2342/trunk@134 6dc7ffe9-61d6-0310-9af1-9938baff3ed1
Diffstat (limited to 'openpcd/firmware/src/start/Cstartup.S')
-rw-r--r--openpcd/firmware/src/start/Cstartup.S249
1 files changed, 132 insertions, 117 deletions
diff --git a/openpcd/firmware/src/start/Cstartup.S b/openpcd/firmware/src/start/Cstartup.S
index 785a18c..12bc4cd 100644
--- a/openpcd/firmware/src/start/Cstartup.S
+++ b/openpcd/firmware/src/start/Cstartup.S
@@ -18,13 +18,138 @@
.equ IRQ_Stack_Size, 0x00000400
-/* #include "AT91SAM7S64_inc.h" */
-
.equ AIC_IVR, (256)
.equ AIC_FVR, (260)
.equ AIC_EOICR, (304)
+ .equ AIC_MCR_RCR, (0xf00)
.equ AT91C_BASE_AIC, (0xFFFFF000)
+/* #include "AT91SAM7S64_inc.h" */
+
+/* Exception Vectors in RAM */
+
+ .text
+ .arm
+ .section .vectram, "ax"
+resetvecR: B resetvecR
+undefvecR: B undefvecR
+swivecR: B swivecR
+pabtvecR: B pabtvecR
+dabtvecR: B dabtvecR
+rsvdvecR: B rsvdvecR
+irqvecR: B IRQ_Handler_EntryR
+fiqvecR:
+
+FIQ_Handler_EntryR:
+
+/*- Switch in SVC/User Mode to allow User Stack access for C code */
+/* because the FIQ is not yet acknowledged*/
+
+/*- Save and r0 in FIQ_Register */
+ mov r9,r0
+ ldr r0 , [r8, #AIC_FVR]
+ msr CPSR_c,#I_BIT | F_BIT | ARM_MODE_SVC
+
+/*- Save scratch/used registers and LR in User Stack */
+ stmfd sp!, { r1-r3, r12, lr}
+
+/*- Branch to the routine pointed by the AIC_FVR */
+ mov r14, pc
+ bx r0
+
+/*- Restore scratch/used registers and LR from User Stack */
+ ldmia sp!, { r1-r3, r12, lr}
+
+/*- Leave Interrupts disabled and switch back in FIQ mode */
+ msr CPSR_c, #I_BIT | F_BIT | ARM_MODE_FIQ
+
+/*- Restore the R0 ARM_MODE_SVC register */
+ mov r0,r9
+
+/*- Restore the Program Counter using the LR_fiq directly in the PC */
+ subs pc,lr,#4
+
+ .global IRQ_Handler_EntryR
+ .func IRQ_Handler_EntryR
+
+IRQ_Handler_EntryR:
+
+/*- Manage Exception Entry */
+/*- Adjust and save LR_irq in IRQ stack */
+ sub lr, lr, #4
+ stmfd sp!, {lr}
+
+/*- Save SPSR need to be saved for nested interrupt */
+ mrs r14, SPSR
+ stmfd sp!, {r14}
+
+/*- Save and r0 in IRQ stack */
+ stmfd sp!, {r0}
+
+/*- Write in the IVR to support Protect Mode */
+/*- No effect in Normal Mode */
+/*- De-assert the NIRQ and clear the source in Protect Mode */
+ ldr r14, =AT91C_BASE_AIC
+ ldr r0 , [r14, #AIC_IVR]
+ str r14, [r14, #AIC_IVR]
+
+/*- Enable Interrupt and Switch in Supervisor Mode */
+ msr CPSR_c, #ARM_MODE_SVC
+
+/*- Save scratch/used registers and LR in User Stack */
+ stmfd sp!, { r1-r3, r12, r14}
+
+/*- Branch to the routine pointed by the AIC_IVR */
+ mov r14, pc
+ bx r0
+/*- Restore scratch/used registers and LR from User Stack*/
+ ldmia sp!, { r1-r3, r12, r14}
+
+/*- Disable Interrupt and switch back in IRQ mode */
+ msr CPSR_c, #I_BIT | ARM_MODE_IRQ
+
+/*- Mark the End of Interrupt on the AIC */
+ ldr r14, =AT91C_BASE_AIC
+ str r14, [r14, #AIC_EOICR]
+
+/*- Restore SPSR_irq and r0 from IRQ stack */
+ ldmia sp!, {r0}
+
+/*- Restore SPSR_irq and r0 from IRQ stack */
+ ldmia sp!, {r14}
+ msr SPSR_cxsf, r14
+
+/*- Restore adjusted LR_irq from IRQ stack directly in the PC */
+ ldmia sp!, {pc}^
+
+ .size IRQ_Handler_EntryR, . - IRQ_Handler_EntryR
+ .endfunc
+
+ .global remap
+ .func remap
+_remap:
+# Remap RAM to 0x00000000 for DFU
+ ldr r1, =AT91C_BASE_AIC
+ mov r2, #0x01
+ str r2, [r1, #AIC_MCR_RCR]
+
+ mov r0, #0 /* argc = 0 */
+ ldr lr,=exit
+ ldr r10,=main
+ bx r10
+ .size remap, . - remap
+ .endfunc
+
+/* "exit" dummy added by mthomas to avoid sbrk write read etc. needed
+ by the newlib default "exit" */
+ .global exit
+ .func exit
+exit:
+ b .
+ .size exit, . - exit
+ .endfunc
+
+
#;------------------------------------------------------------------------------
#;- Section Definition
#;-----------------
@@ -70,42 +195,9 @@ dabtvec:
rsvdvec:
B rsvdvec /* 0x14 reserved */
irqvec:
- B IRQ_Handler_Entry /* 0x18 IRQ */
-fiqvec: /* 0x1c FIQ */
-/*------------------------------------------------------------------------------
-//*- Function : FIQ_Handler_Entry
-//*- Treatments : FIQ Controller Interrupt Handler.
-//*- Called Functions : AIC_FVR[interrupt]
-//*------------------------------------------------------------------------------*/
-
-FIQ_Handler_Entry:
-
-/*- Switch in SVC/User Mode to allow User Stack access for C code */
-/* because the FIQ is not yet acknowledged*/
-
-/*- Save and r0 in FIQ_Register */
- mov r9,r0
- ldr r0 , [r8, #AIC_FVR]
- msr CPSR_c,#I_BIT | F_BIT | ARM_MODE_SVC
-
-/*- Save scratch/used registers and LR in User Stack */
- stmfd sp!, { r1-r3, r12, lr}
-
-/*- Branch to the routine pointed by the AIC_FVR */
- mov r14, pc
- bx r0
-
-/*- Restore scratch/used registers and LR from User Stack */
- ldmia sp!, { r1-r3, r12, lr}
-
-/*- Leave Interrupts disabled and switch back in FIQ mode */
- msr CPSR_c, #I_BIT | F_BIT | ARM_MODE_FIQ
-
-/*- Restore the R0 ARM_MODE_SVC register */
- mov r0,r9
-
-/*- Restore the Program Counter using the LR_fiq directly in the PC */
- subs pc,lr,#4
+ B irqvec /* 0x18 IRQ */
+fiqvec:
+ B fiqvec /* 0x1c FIQ */
.align 0
.RAM_TOP:
.word Top_Stack
@@ -169,8 +261,6 @@ InitReset:
msr CPSR_c, #ARM_MODE_SVC
mov r13, r0 /* Init stack Sup */
-/*- Enable interrupt & Set up Supervisor Mode and set Supervisor Mode Stack*/
-
# Relocate .data section (Copy from ROM to RAM)
LDR R1, =_etext
LDR R2, =_data
@@ -188,87 +278,12 @@ LoopZI: CMP R1, R2
STRLO R0, [R1], #4
BLO LoopZI
- ldr lr,=exit
- ldr r0,=main
+ ldr r0, =_remap
bx r0
-
+
.size _startup, . - _startup
.endfunc
-/* "exit" dummy added by mthomas to avoid sbrk write read etc. needed
- by the newlib default "exit" */
- .global exit
- .func exit
-exit:
- b .
- .size exit, . - exit
- .endfunc
-
-/*------------------------------------------------------------------------------
-//*- Manage exception
-//*---------------
-//*- This module The exception must be ensure in ARM mode
-//*------------------------------------------------------------------------------
-//*------------------------------------------------------------------------------
-//*- Function : IRQ_Handler_Entry
-//*- Treatments : IRQ Controller Interrupt Handler.
-//*- Called Functions : AIC_IVR[interrupt]
-//*------------------------------------------------------------------------------*/
- .global IRQ_Handler_Entry
- .func IRQ_Handler_Entry
-
-IRQ_Handler_Entry:
-
-/*- Manage Exception Entry */
-/*- Adjust and save LR_irq in IRQ stack */
- sub lr, lr, #4
- stmfd sp!, {lr}
-
-/*- Save SPSR need to be saved for nested interrupt */
- mrs r14, SPSR
- stmfd sp!, {r14}
-
-/*- Save and r0 in IRQ stack */
- stmfd sp!, {r0}
-
-/*- Write in the IVR to support Protect Mode */
-/*- No effect in Normal Mode */
-/*- De-assert the NIRQ and clear the source in Protect Mode */
- ldr r14, =AT91C_BASE_AIC
- ldr r0 , [r14, #AIC_IVR]
- str r14, [r14, #AIC_IVR]
-
-/*- Enable Interrupt and Switch in Supervisor Mode */
- msr CPSR_c, #ARM_MODE_SVC
-
-/*- Save scratch/used registers and LR in User Stack */
- stmfd sp!, { r1-r3, r12, r14}
-
-/*- Branch to the routine pointed by the AIC_IVR */
- mov r14, pc
- bx r0
-/*- Restore scratch/used registers and LR from User Stack*/
- ldmia sp!, { r1-r3, r12, r14}
-
-/*- Disable Interrupt and switch back in IRQ mode */
- msr CPSR_c, #I_BIT | ARM_MODE_IRQ
-
-/*- Mark the End of Interrupt on the AIC */
- ldr r14, =AT91C_BASE_AIC
- str r14, [r14, #AIC_EOICR]
-
-/*- Restore SPSR_irq and r0 from IRQ stack */
- ldmia sp!, {r0}
-
-/*- Restore SPSR_irq and r0 from IRQ stack */
- ldmia sp!, {r14}
- msr SPSR_cxsf, r14
-
-/*- Restore adjusted LR_irq from IRQ stack directly in the PC */
- ldmia sp!, {pc}^
-
- .size IRQ_Handler_Entry, . - IRQ_Handler_Entry
- .endfunc
/*---------------------------------------------------------------
//* ?EXEPTION_VECTOR
//* This module is only linked if needed for closing files.
personal git repositories of Harald Welte. Your mileage may vary