--- /dev/null
+/*
+ * armboot - Startup Code for ARM1176 CPU-core
+ *
+ * Copyright (c) 2007 Samsung Electronics
+ *
+ * Copyright (C) 2008
+ * Guennadi Liakhovetki, DENX Software Engineering, <lg@denx.de>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ *
+ * 2007-09-21 - Restructured codes by jsgood (jsgood.yang@samsung.com)
+ * 2007-09-21 - Added MoviNAND and OneNAND boot codes by
+ * jsgood (jsgood.yang@samsung.com)
+ * Base codes by scsuh (sc.suh)
+ */
+
+#include <asm-offsets.h>
+#include <config.h>
+#include <version.h>
+
+#ifndef CONFIG_SYS_PHY_UBOOT_BASE
+#define CONFIG_SYS_PHY_UBOOT_BASE CONFIG_SYS_UBOOT_BASE
+#endif
+
+/*
+ *************************************************************************
+ *
+ * Jump vector table as in table 3.1 in [1]
+ *
+ *************************************************************************
+ */
+
+.globl _start
+_start: b reset
+#ifndef CONFIG_SPL_BUILD
+ ldr pc, _undefined_instruction
+ ldr pc, _software_interrupt
+ ldr pc, _prefetch_abort
+ ldr pc, _data_abort
+ ldr pc, _not_used
+ ldr pc, _irq
+ ldr pc, _fiq
+
+_undefined_instruction:
+ .word undefined_instruction
+_software_interrupt:
+ .word software_interrupt
+_prefetch_abort:
+ .word prefetch_abort
+_data_abort:
+ .word data_abort
+_not_used:
+ .word not_used
+_irq:
+ .word irq
+_fiq:
+ .word fiq
+_pad:
+ .word 0x12345678 /* now 16*4=64 */
+#else
+ . = _start + 64
+#endif
+
+.global _end_vect
+_end_vect:
+ .balignl 16,0xdeadbeef
+/*
+ *************************************************************************
+ *
+ * Startup Code (reset vector)
+ *
+ * do important init only if we don't start from memory!
+ * setup Memory and board specific bits prior to relocation.
+ * relocate armboot to ram
+ * setup stack
+ *
+ *************************************************************************
+ */
+
+/* IRQ stack memory (calculated at run-time) + 8 bytes */
+.globl IRQ_STACK_START_IN
+IRQ_STACK_START_IN:
+ .word 0x0badc0de
+
+/*
+ * the actual reset code
+ */
+
+reset:
+ /*
+ * set the cpu to SVC32 mode
+ */
+ mrs r0, cpsr
+ bic r0, r0, #0x3f
+ orr r0, r0, #0xd3
+ msr cpsr, r0
+
+/*
+ *************************************************************************
+ *
+ * CPU_init_critical registers
+ *
+ * setup important registers
+ * setup memory timing
+ *
+ *************************************************************************
+ */
+ /*
+ * we do sys-critical inits only at reboot,
+ * not when booting from ram!
+ */
+cpu_init_crit:
+ /*
+ * When booting from NAND - it has definitely been a reset, so, no need
+ * to flush caches and disable the MMU
+ */
+#ifndef CONFIG_SPL_BUILD
+ /*
+ * flush v4 I/D caches
+ */
+ mov r0, #0
+ mcr p15, 0, r0, c7, c7, 0 /* flush v3/v4 cache */
+ mcr p15, 0, r0, c8, c7, 0 /* flush v4 TLB */
+
+ /*
+ * disable MMU stuff and caches
+ */
+ mrc p15, 0, r0, c1, c0, 0
+ bic r0, r0, #0x00002300 @ clear bits 13, 9:8 (--V- --RS)
+ bic r0, r0, #0x00000087 @ clear bits 7, 2:0 (B--- -CAM)
+ orr r0, r0, #0x00000002 @ set bit 2 (A) Align
+ orr r0, r0, #0x00001000 @ set bit 12 (I) I-Cache
+
+ /* Prepare to disable the MMU */
+ adr r2, mmu_disable_phys
+ sub r2, r2, #(CONFIG_SYS_PHY_UBOOT_BASE - CONFIG_SYS_TEXT_BASE)
+ b mmu_disable
+
+ .align 5
+ /* Run in a single cache-line */
+mmu_disable:
+ mcr p15, 0, r0, c1, c0, 0
+ nop
+ nop
+ mov pc, r2
+mmu_disable_phys:
+
+#ifdef CONFIG_DISABLE_TCM
+ /*
+ * Disable the TCMs
+ */
+ mrc p15, 0, r0, c0, c0, 2 /* Return TCM details */
+ cmp r0, #0
+ beq skip_tcmdisable
+ mov r1, #0
+ mov r2, #1
+ tst r0, r2
+ mcrne p15, 0, r1, c9, c1, 1 /* Disable Instruction TCM if present*/
+ tst r0, r2, LSL #16
+ mcrne p15, 0, r1, c9, c1, 0 /* Disable Data TCM if present*/
+skip_tcmdisable:
+#endif
+#endif
+
+#ifdef CONFIG_PERIPORT_REMAP
+ /* Peri port setup */
+ ldr r0, =CONFIG_PERIPORT_BASE
+ orr r0, r0, #CONFIG_PERIPORT_SIZE
+ mcr p15,0,r0,c15,c2,4
+#endif
+
+ /*
+ * Go setup Memory and board specific bits prior to relocation.
+ */
+ bl lowlevel_init /* go setup pll,mux,memory */
+
+ bl _main
+
+/*------------------------------------------------------------------------------*/
+
+ .globl c_runtime_cpu_setup
+c_runtime_cpu_setup:
+
+ mov pc, lr
+
+#ifndef CONFIG_SPL_BUILD
+/*
+ *************************************************************************
+ *
+ * Interrupt handling
+ *
+ *************************************************************************
+ */
+@
+@ IRQ stack frame.
+@
+#define S_FRAME_SIZE 72
+
+#define S_OLD_R0 68
+#define S_PSR 64
+#define S_PC 60
+#define S_LR 56
+#define S_SP 52
+
+#define S_IP 48
+#define S_FP 44
+#define S_R10 40
+#define S_R9 36
+#define S_R8 32
+#define S_R7 28
+#define S_R6 24
+#define S_R5 20
+#define S_R4 16
+#define S_R3 12
+#define S_R2 8
+#define S_R1 4
+#define S_R0 0
+
+#define MODE_SVC 0x13
+#define I_BIT 0x80
+
+/*
+ * use bad_save_user_regs for abort/prefetch/undef/swi ...
+ */
+
+ .macro bad_save_user_regs
+ /* carve out a frame on current user stack */
+ sub sp, sp, #S_FRAME_SIZE
+ /* Save user registers (now in svc mode) r0-r12 */
+ stmia sp, {r0 - r12}
+
+ ldr r2, IRQ_STACK_START_IN
+ /* get values for "aborted" pc and cpsr (into parm regs) */
+ ldmia r2, {r2 - r3}
+ /* grab pointer to old stack */
+ add r0, sp, #S_FRAME_SIZE
+
+ add r5, sp, #S_SP
+ mov r1, lr
+ /* save sp_SVC, lr_SVC, pc, cpsr */
+ stmia r5, {r0 - r3}
+ /* save current stack into r0 (param register) */
+ mov r0, sp
+ .endm
+
+ .macro get_bad_stack
+ ldr r13, IRQ_STACK_START_IN @ setup our mode stack
+
+ /* save caller lr in position 0 of saved stack */
+ str lr, [r13]
+ /* get the spsr */
+ mrs lr, spsr
+ /* save spsr in position 1 of saved stack */
+ str lr, [r13, #4]
+
+ /* prepare SVC-Mode */
+ mov r13, #MODE_SVC
+ @ msr spsr_c, r13
+ /* switch modes, make sure moves will execute */
+ msr spsr, r13
+ /* capture return pc */
+ mov lr, pc
+ /* jump to next instruction & switch modes. */
+ movs pc, lr
+ .endm
+
+ .macro get_bad_stack_swi
+ /* space on current stack for scratch reg. */
+ sub r13, r13, #4
+ /* save R0's value. */
+ str r0, [r13]
+ ldr r13, IRQ_STACK_START_IN @ setup our mode stack
+ /* save caller lr in position 0 of saved stack */
+ str lr, [r0]
+ /* get the spsr */
+ mrs lr, spsr
+ /* save spsr in position 1 of saved stack */
+ str lr, [r0, #4]
+ /* restore lr */
+ ldr lr, [r0]
+ /* restore r0 */
+ ldr r0, [r13]
+ /* pop stack entry */
+ add r13, r13, #4
+ .endm
+
+/*
+ * exception handlers
+ */
+ .align 5
+undefined_instruction:
+ get_bad_stack
+ bad_save_user_regs
+ bl do_undefined_instruction
+
+ .align 5
+software_interrupt:
+ get_bad_stack_swi
+ bad_save_user_regs
+ bl do_software_interrupt
+
+ .align 5
+prefetch_abort:
+ get_bad_stack
+ bad_save_user_regs
+ bl do_prefetch_abort
+
+ .align 5
+data_abort:
+ get_bad_stack
+ bad_save_user_regs
+ bl do_data_abort
+
+ .align 5
+not_used:
+ get_bad_stack
+ bad_save_user_regs
+ bl do_not_used
+
+ .align 5
+irq:
+ get_bad_stack
+ bad_save_user_regs
+ bl do_irq
+
+ .align 5
+fiq:
+ get_bad_stack
+ bad_save_user_regs
+ bl do_fiq
+#endif /* CONFIG_SPL_BUILD */
Code Review / kvmfornfv.git / blobdiff