diff options
Diffstat (limited to 'target/linux/at91/image/dfboot/src/cstartup_ram.S')
| -rw-r--r-- | target/linux/at91/image/dfboot/src/cstartup_ram.S | 144 |
1 files changed, 0 insertions, 144 deletions
diff --git a/target/linux/at91/image/dfboot/src/cstartup_ram.S b/target/linux/at91/image/dfboot/src/cstartup_ram.S deleted file mode 100644 index 2239000..0000000 --- a/target/linux/at91/image/dfboot/src/cstartup_ram.S +++ /dev/null @@ -1,144 +0,0 @@ -#include "AT91RM9200_inc.h" - -/*--------------------------- -ARM Core Mode and Status Bits ----------------------------*/ -.section start - .text - -#define ARM_MODE_USER 0x10 -#define ARM_MODE_FIQ 0x11 -#define ARM_MODE_IRQ 0x12 -#define ARM_MODE_SVC 0x13 -#define ARM_MODE_ABORT 0x17 -#define ARM_MODE_UNDEF 0x1B -#define ARM_MODE_SYS 0x1F - -#define I_BIT 0x80 -#define F_BIT 0x40 -#define T_BIT 0x20 - -/*---------------------------------------------------------------------------- - Area Definition ----------------- - Must be defined as function to put first in the code as it must be mapped - at offset 0 of the flash EBI_CSR0, ie. at address 0 before remap. -_---------------------------------------------------------------------------*/ - - .align 4 - .globl _start -_start: - -/*---------------------------------------------------------------------------- - Exception vectors ( before Remap ) ------------------------------------- - These vectors are read at address 0. - They absolutely requires to be in relative addresssing mode in order to - guarantee a valid jump. For the moment, all are just looping (what may be - dangerous in a final system). If an exception occurs before remap, this - would result in an infinite loop. -----------------------------------------------------------------------------*/ - b reset /* reset */ - b undefvec /* Undefined Instruction */ - b swivec /* Software Interrupt */ - b pabtvec /* Prefetch Abort */ - b dabtvec /* Data Abort */ - b rsvdvec /* reserved */ - b aicvec /* IRQ : read the AIC */ - b fiqvec /* FIQ */ - -undefvec: -swivec: -pabtvec: -dabtvec: -rsvdvec: -aicvec: -fiqvec: - b undefvec - -reset: - -#define MEMEND 0x00004000 - -/* ---------------------------- - Setup the stack for each mode ----------------------------- */ - -#define IRQ_STACK_SIZE 0x10 -#define FIQ_STACK_SIZE 0x04 -#define ABT_STACK_SIZE 0x04 -#define UND_STACK_SIZE 0x04 -#define SVC_STACK_SIZE 0x10 -#define USER_STACK_SIZE 0x400 - - ldr r0,= MEMEND - -/*- Set up Supervisor Mode and set Supervisor Mode Stack*/ - msr CPSR_c, #ARM_MODE_SVC | I_BIT | F_BIT - mov r13, r0 /* Init stack Undef*/ - sub r0, r0, #SVC_STACK_SIZE - -/*- Set up Interrupt Mode and set IRQ Mode Stack*/ - msr CPSR_c, #ARM_MODE_IRQ | I_BIT | F_BIT - mov r13, r0 /* Init stack IRQ*/ - sub r0, r0, #IRQ_STACK_SIZE - -/*- Set up Fast Interrupt Mode and set FIQ Mode Stack*/ - msr CPSR_c, #ARM_MODE_FIQ | I_BIT | F_BIT - mov r13, r0 /* Init stack FIQ*/ - sub r0, r0, #FIQ_STACK_SIZE - -/*- Set up Abort Mode and set Abort Mode Stack*/ - msr CPSR_c, #ARM_MODE_ABORT | I_BIT | F_BIT - mov r13, r0 /* Init stack Abort*/ - sub r0, r0, #ABT_STACK_SIZE - -/*- Set up Undefined Instruction Mode and set Undef Mode Stack*/ - msr CPSR_c, #ARM_MODE_UNDEF | I_BIT | F_BIT - mov r13, r0 /* Init stack Undef*/ - sub r0, r0, #UND_STACK_SIZE - -/*- Set up user Mode and set System Mode Stack*/ - msr CPSR_c, #ARM_MODE_SYS | I_BIT | F_BIT - bic r0, r0, #3 /* Insure word alignement */ - mov sp, r0 /* Init stack System */ - - - ldr r0, = AT91F_LowLevelInit - mov lr, pc - bx r0 - -/*---------------------------------------- - Read/modify/write CP15 control register -----------------------------------------*/ - mrc p15, 0, r0, c1, c0,0 /* read cp15 control registre (cp15 r1) in r0 */ - ldr r3,= 0xC0000080 /* Reset bit :Little Endian end fast bus mode */ - ldr r4,= 0xC0001000 /* Set bit :Asynchronous clock mode, Not Fast Bus, I-Cache enable */ - bic r0, r0, r3 - orr r0, r0, r4 - mcr p15, 0, r0, c1, c0,0 /* write r0 in cp15 control registre (cp15 r1) */ - -/* Enable interrupts */ - msr CPSR_c, #ARM_MODE_SYS | F_BIT - -/*------------------------------------------------------------------------------ -- Branch on C code Main function (with interworking) ----------------------------------------------------- -- Branch must be performed by an interworking call as either an ARM or Thumb -- _start function must be supported. This makes the code not position- -- independent. A Branch with link would generate errors -----------------------------------------------------------------------------*/ - -/*- Branch to _start by interworking*/ - ldr r4, = main - mov lr, pc - bx r4 - -/*----------------------------------------------------------------------------- -- Loop for ever ---------------- -- End of application. Normally, never occur. -- Could jump on Software Reset ( B 0x0 ). -------------------------------------------------------------------------------*/ -End: - b End |