https://github.com/torvalds/linux
Tip revision: 8005c49d9aea74d382f474ce11afbbc7d7130bec authored by Linus Torvalds on 16 November 2015, 01:00:27 UTC
Linux 4.4-rc1
Linux 4.4-rc1
Tip revision: 8005c49
head-rom.S
/*
* head-rom.S - startup code for Motorola 68360
*
* Copyright (C) SED Systems, a Division of Calian Ltd.
* Based on: arch/m68knommu/platform/68328/pilot/crt0_rom.S
* Based on: arch/m68knommu/platform/68360/uCquicc/crt0_rom.S, 2.0.38.1.pre7
* uClinux Kernel
* Copyright (C) Michael Leslie <mleslie@lineo.com>
* Based on: arch/m68knommu/platform/68EZ328/ucsimm/crt0_rom.S
* Copyright (C) 1998 D. Jeff Dionne <jeff@uclinux.org>,
*
*/
.global _stext
.global __bss_start
.global _start
.global _rambase
.global _ramvec
.global _ramstart
.global _ramend
.global _quicc_base
.global _periph_base
#define RAMEND (CONFIG_RAMBASE + CONFIG_RAMSIZE)
#define REGB 0x1000
#define PEPAR (_dprbase + REGB + 0x0016)
#define GMR (_dprbase + REGB + 0x0040)
#define OR0 (_dprbase + REGB + 0x0054)
#define BR0 (_dprbase + REGB + 0x0050)
#define OR1 (_dprbase + REGB + 0x0064)
#define BR1 (_dprbase + REGB + 0x0060)
#define OR2 (_dprbase + REGB + 0x0074)
#define BR2 (_dprbase + REGB + 0x0070)
#define OR3 (_dprbase + REGB + 0x0084)
#define BR3 (_dprbase + REGB + 0x0080)
#define OR4 (_dprbase + REGB + 0x0094)
#define BR4 (_dprbase + REGB + 0x0090)
#define OR5 (_dprbase + REGB + 0x00A4)
#define BR5 (_dprbase + REGB + 0x00A0)
#define OR6 (_dprbase + REGB + 0x00b4)
#define BR6 (_dprbase + REGB + 0x00b0)
#define OR7 (_dprbase + REGB + 0x00c4)
#define BR7 (_dprbase + REGB + 0x00c0)
#define MCR (_dprbase + REGB + 0x0000)
#define AVR (_dprbase + REGB + 0x0008)
#define SYPCR (_dprbase + REGB + 0x0022)
#define PLLCR (_dprbase + REGB + 0x0010)
#define CLKOCR (_dprbase + REGB + 0x000C)
#define CDVCR (_dprbase + REGB + 0x0014)
#define BKAR (_dprbase + REGB + 0x0030)
#define BKCR (_dprbase + REGB + 0x0034)
#define SWIV (_dprbase + REGB + 0x0023)
#define PICR (_dprbase + REGB + 0x0026)
#define PITR (_dprbase + REGB + 0x002A)
/* Define for all memory configuration */
#define MCU_SIM_GMR 0x00000000
#define SIM_OR_MASK 0x0fffffff
/* Defines for chip select zero - the flash */
#define SIM_OR0_MASK 0x20000000
#define SIM_BR0_MASK 0x00000001
/* Defines for chip select one - the RAM */
#define SIM_OR1_MASK 0x10000000
#define SIM_BR1_MASK 0x00000001
#define MCU_SIM_MBAR_ADRS 0x0003ff00
#define MCU_SIM_MBAR_BA_MASK 0xfffff000
#define MCU_SIM_MBAR_AS_MASK 0x00000001
#define MCU_SIM_PEPAR 0x00B4
#define MCU_DISABLE_INTRPTS 0x2700
#define MCU_SIM_AVR 0x00
#define MCU_SIM_MCR 0x00005cff
#define MCU_SIM_CLKOCR 0x00
#define MCU_SIM_PLLCR 0x8000
#define MCU_SIM_CDVCR 0x0000
#define MCU_SIM_SYPCR 0x0000
#define MCU_SIM_SWIV 0x00
#define MCU_SIM_PICR 0x0000
#define MCU_SIM_PITR 0x0000
#include <asm/m68360_regs.h>
/*
* By the time this RAM specific code begins to execute, DPRAM
* and DRAM should already be mapped and accessible.
*/
.text
_start:
_stext:
nop
ori.w #MCU_DISABLE_INTRPTS, %sr /* disable interrupts: */
/* We should not need to setup the boot stack the reset should do it. */
movea.l #RAMEND, %sp /* set up stack at the end of DRAM:*/
set_mbar_register:
moveq.l #0x07, %d1 /* Setup MBAR */
movec %d1, %dfc
lea.l MCU_SIM_MBAR_ADRS, %a0
move.l #_dprbase, %d0
andi.l #MCU_SIM_MBAR_BA_MASK, %d0
ori.l #MCU_SIM_MBAR_AS_MASK, %d0
moves.l %d0, %a0@
moveq.l #0x05, %d1
movec.l %d1, %dfc
/* Now we can begin to access registers in DPRAM */
set_sim_mcr:
/* Set Module Configuration Register */
move.l #MCU_SIM_MCR, MCR
/* to do: Determine cause of reset */
/*
* configure system clock MC68360 p. 6-40
* (value +1)*osc/128 = system clock
* or
* (value + 1)*osc = system clock
* You do not need to divide the oscillator by 128 unless you want to.
*/
set_sim_clock:
move.w #MCU_SIM_PLLCR, PLLCR
move.b #MCU_SIM_CLKOCR, CLKOCR
move.w #MCU_SIM_CDVCR, CDVCR
/* Wait for the PLL to settle */
move.w #16384, %d0
pll_settle_wait:
subi.w #1, %d0
bne pll_settle_wait
/* Setup the system protection register, and watchdog timer register */
move.b #MCU_SIM_SWIV, SWIV
move.w #MCU_SIM_PICR, PICR
move.w #MCU_SIM_PITR, PITR
move.w #MCU_SIM_SYPCR, SYPCR
/* Clear DPRAM - system + parameter */
movea.l #_dprbase, %a0
movea.l #_dprbase+0x2000, %a1
/* Copy 0 to %a0 until %a0 == %a1 */
clear_dpram:
movel #0, %a0@+
cmpal %a0, %a1
bhi clear_dpram
configure_memory_controller:
/* Set up Global Memory Register (GMR) */
move.l #MCU_SIM_GMR, %d0
move.l %d0, GMR
configure_chip_select_0:
move.l #0x00400000, %d0
subq.l #0x01, %d0
eori.l #SIM_OR_MASK, %d0
ori.l #SIM_OR0_MASK, %d0
move.l %d0, OR0
move.l #__rom_start, %d0
ori.l #SIM_BR0_MASK, %d0
move.l %d0, BR0
move.l #0x0, BR1
move.l #0x0, BR2
move.l #0x0, BR3
move.l #0x0, BR4
move.l #0x0, BR5
move.l #0x0, BR6
move.l #0x0, BR7
move.w #MCU_SIM_PEPAR, PEPAR
/* point to vector table: */
move.l #_romvec, %a0
move.l #_ramvec, %a1
copy_vectors:
move.l %a0@, %d0
move.l %d0, %a1@
move.l %a0@, %a1@
addq.l #0x04, %a0
addq.l #0x04, %a1
cmp.l #_start, %a0
blt copy_vectors
move.l #_ramvec, %a1
movec %a1, %vbr
/* Copy data segment from ROM to RAM */
moveal #_etext, %a0
moveal #_sdata, %a1
moveal #_edata, %a2
/* Copy %a0 to %a1 until %a1 == %a2 */
LD1:
move.l %a0@, %d0
addq.l #0x04, %a0
move.l %d0, %a1@
addq.l #0x04, %a1
cmp.l #_edata, %a1
blt LD1
moveal #__bss_start, %a0
moveal #__bss_stop, %a1
/* Copy 0 to %a0 until %a0 == %a1 */
L1:
movel #0, %a0@+
cmpal %a0, %a1
bhi L1
load_quicc:
move.l #_dprbase, _quicc_base
store_ram_size:
/* Set ram size information */
move.l #_sdata, _rambase
move.l #__bss_stop, _ramstart
move.l #RAMEND, %d0
sub.l #0x1000, %d0 /* Reserve 4K for stack space.*/
move.l %d0, _ramend /* Different from RAMEND.*/
pea 0
pea env
pea %sp@(4)
pea 0
lea init_thread_union, %a2
lea 0x2000(%a2), %sp
lp:
jsr start_kernel
_exit:
jmp _exit
.data
.align 4
env:
.long 0
_quicc_base:
.long 0
_periph_base:
.long 0
_ramvec:
.long 0
_rambase:
.long 0
_ramstart:
.long 0
_ramend:
.long 0
_dprbase:
.long 0xffffe000
.text
/*
* These are the exception vectors at boot up, they are copied into RAM
* and then overwritten as needed.
*/
.section ".data..initvect","awx"
.long RAMEND /* Reset: Initial Stack Pointer - 0. */
.long _start /* Reset: Initial Program Counter - 1. */
.long buserr /* Bus Error - 2. */
.long trap /* Address Error - 3. */
.long trap /* Illegal Instruction - 4. */
.long trap /* Divide by zero - 5. */
.long trap /* CHK, CHK2 Instructions - 6. */
.long trap /* TRAPcc, TRAPV Instructions - 7. */
.long trap /* Privilege Violation - 8. */
.long trap /* Trace - 9. */
.long trap /* Line 1010 Emulator - 10. */
.long trap /* Line 1111 Emualtor - 11. */
.long trap /* Harware Breakpoint - 12. */
.long trap /* (Reserved for Coprocessor Protocol Violation)- 13. */
.long trap /* Format Error - 14. */
.long trap /* Uninitialized Interrupt - 15. */
.long trap /* (Unassigned, Reserver) - 16. */
.long trap /* (Unassigned, Reserver) - 17. */
.long trap /* (Unassigned, Reserver) - 18. */
.long trap /* (Unassigned, Reserver) - 19. */
.long trap /* (Unassigned, Reserver) - 20. */
.long trap /* (Unassigned, Reserver) - 21. */
.long trap /* (Unassigned, Reserver) - 22. */
.long trap /* (Unassigned, Reserver) - 23. */
.long trap /* Spurious Interrupt - 24. */
.long trap /* Level 1 Interrupt Autovector - 25. */
.long trap /* Level 2 Interrupt Autovector - 26. */
.long trap /* Level 3 Interrupt Autovector - 27. */
.long trap /* Level 4 Interrupt Autovector - 28. */
.long trap /* Level 5 Interrupt Autovector - 29. */
.long trap /* Level 6 Interrupt Autovector - 30. */
.long trap /* Level 7 Interrupt Autovector - 31. */
.long system_call /* Trap Instruction Vectors 0 - 32. */
.long trap /* Trap Instruction Vectors 1 - 33. */
.long trap /* Trap Instruction Vectors 2 - 34. */
.long trap /* Trap Instruction Vectors 3 - 35. */
.long trap /* Trap Instruction Vectors 4 - 36. */
.long trap /* Trap Instruction Vectors 5 - 37. */
.long trap /* Trap Instruction Vectors 6 - 38. */
.long trap /* Trap Instruction Vectors 7 - 39. */
.long trap /* Trap Instruction Vectors 8 - 40. */
.long trap /* Trap Instruction Vectors 9 - 41. */
.long trap /* Trap Instruction Vectors 10 - 42. */
.long trap /* Trap Instruction Vectors 11 - 43. */
.long trap /* Trap Instruction Vectors 12 - 44. */
.long trap /* Trap Instruction Vectors 13 - 45. */
.long trap /* Trap Instruction Vectors 14 - 46. */
.long trap /* Trap Instruction Vectors 15 - 47. */
.long 0 /* (Reserved for Coprocessor) - 48. */
.long 0 /* (Reserved for Coprocessor) - 49. */
.long 0 /* (Reserved for Coprocessor) - 50. */
.long 0 /* (Reserved for Coprocessor) - 51. */
.long 0 /* (Reserved for Coprocessor) - 52. */
.long 0 /* (Reserved for Coprocessor) - 53. */
.long 0 /* (Reserved for Coprocessor) - 54. */
.long 0 /* (Reserved for Coprocessor) - 55. */
.long 0 /* (Reserved for Coprocessor) - 56. */
.long 0 /* (Reserved for Coprocessor) - 57. */
.long 0 /* (Reserved for Coprocessor) - 58. */
.long 0 /* (Unassigned, Reserved) - 59. */
.long 0 /* (Unassigned, Reserved) - 60. */
.long 0 /* (Unassigned, Reserved) - 61. */
.long 0 /* (Unassigned, Reserved) - 62. */
.long 0 /* (Unassigned, Reserved) - 63. */
/* The assignment of these vectors to the CPM is */
/* dependent on the configuration of the CPM vba */
/* fields. */
.long 0 /* (User-Defined Vectors 1) CPM Error - 64. */
.long 0 /* (User-Defined Vectors 2) CPM Parallel IO PC11- 65. */
.long 0 /* (User-Defined Vectors 3) CPM Parallel IO PC10- 66. */
.long 0 /* (User-Defined Vectors 4) CPM SMC2 / PIP - 67. */
.long 0 /* (User-Defined Vectors 5) CPM SMC1 - 68. */
.long 0 /* (User-Defined Vectors 6) CPM SPI - 69. */
.long 0 /* (User-Defined Vectors 7) CPM Parallel IO PC9 - 70. */
.long 0 /* (User-Defined Vectors 8) CPM Timer 4 - 71. */
.long 0 /* (User-Defined Vectors 9) CPM Reserved - 72. */
.long 0 /* (User-Defined Vectors 10) CPM Parallel IO PC8- 73. */
.long 0 /* (User-Defined Vectors 11) CPM Parallel IO PC7- 74. */
.long 0 /* (User-Defined Vectors 12) CPM Parallel IO PC6- 75. */
.long 0 /* (User-Defined Vectors 13) CPM Timer 3 - 76. */
.long 0 /* (User-Defined Vectors 14) CPM Reserved - 77. */
.long 0 /* (User-Defined Vectors 15) CPM Parallel IO PC5- 78. */
.long 0 /* (User-Defined Vectors 16) CPM Parallel IO PC4- 79. */
.long 0 /* (User-Defined Vectors 17) CPM Reserved - 80. */
.long 0 /* (User-Defined Vectors 18) CPM RISC Timer Tbl - 81. */
.long 0 /* (User-Defined Vectors 19) CPM Timer 2 - 82. */
.long 0 /* (User-Defined Vectors 21) CPM Reserved - 83. */
.long 0 /* (User-Defined Vectors 22) CPM IDMA2 - 84. */
.long 0 /* (User-Defined Vectors 23) CPM IDMA1 - 85. */
.long 0 /* (User-Defined Vectors 24) CPM SDMA Bus Err - 86. */
.long 0 /* (User-Defined Vectors 25) CPM Parallel IO PC3- 87. */
.long 0 /* (User-Defined Vectors 26) CPM Parallel IO PC2- 88. */
.long 0 /* (User-Defined Vectors 27) CPM Timer 1 - 89. */
.long 0 /* (User-Defined Vectors 28) CPM Parallel IO PC1- 90. */
.long 0 /* (User-Defined Vectors 29) CPM SCC 4 - 91. */
.long 0 /* (User-Defined Vectors 30) CPM SCC 3 - 92. */
.long 0 /* (User-Defined Vectors 31) CPM SCC 2 - 93. */
.long 0 /* (User-Defined Vectors 32) CPM SCC 1 - 94. */
.long 0 /* (User-Defined Vectors 33) CPM Parallel IO PC0- 95. */
/* I don't think anything uses the vectors after here. */
.long 0 /* (User-Defined Vectors 34) - 96. */
.long 0,0,0,0,0 /* (User-Defined Vectors 35 - 39). */
.long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 40 - 49). */
.long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 50 - 59). */
.long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 60 - 69). */
.long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 70 - 79). */
.long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 80 - 89). */
.long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 90 - 99). */
.long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 100 - 109). */
.long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 110 - 119). */
.long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 120 - 129). */
.long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 130 - 139). */
.long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 140 - 149). */
.long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 150 - 159). */
.long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 160 - 169). */
.long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 170 - 179). */
.long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 180 - 189). */
.long 0,0,0 /* (User-Defined Vectors 190 - 192). */
.text
ignore: rte
