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u-boot/arch/m68k/cpu/mcf52x2/start.S
Marek Vasut 94f9401812 arch: m68k: Add QEMU specific RAMBAR workaround 
The QEMU emulation of m68k does not support RAMBAR accesses,
add Kconfig option which inhibits those accesses, so that
U-Boot can be started in m68k QEMU for CI testing purpopses
until QEMU emulation improves.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
2023-04-15 21:36:07 +02:00

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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (C) 2003 Josef Baumgartner <josef.baumgartner@telex.de>
* Based on code from Bernhard Kuhn <bkuhn@metrowerks.com>
*/
#include <asm-offsets.h>
#include <config.h>
#include <asm/cache.h>
#define _START _start
#define _FAULT _fault
#define SAVE_ALL \
move.w #0x2700,%sr; /* disable intrs */ \
subl #60,%sp; /* space for 15 regs */ \
moveml %d0-%d7/%a0-%a6,%sp@; \
#define RESTORE_ALL \
moveml %sp@,%d0-%d7/%a0-%a6; \
addl #60,%sp; /* space for 15 regs */ \
rte
/* If we come from a pre-loader we don't need an initial exception
* table.
*/
#if !defined(CONFIG_MONITOR_IS_IN_RAM)
.text
/*
* Vector table. This is used for initial platform startup.
* These vectors are to catch any un-intended traps.
*/
_vectors:
.long 0x00000000 /* Flash offset is 0 until we setup CS0 */
#if defined(CONFIG_M5282) && (CONFIG_TEXT_BASE == CFG_SYS_INT_FLASH_BASE)
.long _start - CONFIG_TEXT_BASE
#else
.long _START
#endif
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
#endif
.text
#if defined(CFG_SYS_INT_FLASH_BASE) && \
(defined(CONFIG_M5282) || defined(CONFIG_M5281))
#if (CONFIG_TEXT_BASE == CFG_SYS_INT_FLASH_BASE)
.long 0x55AA55AA,0xAA55AA55 /* CFM Backdoorkey */
.long 0xFFFFFFFF /* all sectors protected */
.long 0x00000000 /* supervisor/User restriction */
.long 0x00000000 /* programm/data space restriction */
.long 0x00000000 /* Flash security */
#endif
#endif
.globl _start
_start:
nop
nop
move.w #0x2700,%sr
#if defined(CONFIG_M5208) && !defined(CONFIG_M68K_QEMU)
/* Initialize RAMBAR: locate SRAM and validate it */
move.l #(CFG_SYS_INIT_RAM_ADDR + CFG_SYS_INIT_RAM_CTRL), %d0
movec %d0, %RAMBAR1
#endif
#if defined(CONFIG_M5272) || defined(CONFIG_M5249) || defined(CONFIG_M5253)
/* set MBAR address + valid flag */
move.l #(CFG_SYS_MBAR + 1), %d0
move.c %d0, %MBAR
/*** The 5249 has MBAR2 as well ***/
#ifdef CFG_SYS_MBAR2
/* Get MBAR2 address */
move.l #(CFG_SYS_MBAR2 + 1), %d0
/* Set MBAR2 */
movec %d0, #0xc0e
#endif
move.l #(CFG_SYS_INIT_RAM_ADDR + 1), %d0
movec %d0, %RAMBAR0
#endif /* CONFIG_M5272 || CONFIG_M5249 || CONFIG_M5253 */
#if (defined(CONFIG_M5282) || defined(CONFIG_M5271)) && !defined(CONFIG_M68K_QEMU)
/* set MBAR address + valid flag */
move.l #(CFG_SYS_MBAR + 1), %d0
move.l %d0, 0x40000000
/* Initialize RAMBAR1: locate SRAM and validate it */
move.l #(CFG_SYS_INIT_RAM_ADDR + 0x21), %d0
movec %d0, %RAMBAR1
#if defined(CONFIG_M5282)
#if (CONFIG_TEXT_BASE == CFG_SYS_INT_FLASH_BASE)
/*
* Setup code in SRAM to initialize FLASHBAR,
* if start from internal Flash
*/
move.l #(_flashbar_setup-CFG_SYS_INT_FLASH_BASE), %a0
move.l #(_flashbar_setup_end-CFG_SYS_INT_FLASH_BASE), %a1
move.l #(CFG_SYS_INIT_RAM_ADDR), %a2
_copy_flash:
move.l (%a0)+, (%a2)+
cmp.l %a0, %a1
bgt.s _copy_flash
jmp CFG_SYS_INIT_RAM_ADDR
_flashbar_setup:
/* Initialize FLASHBAR: locate internal Flash and validate it */
move.l #(CFG_SYS_INT_FLASH_BASE + CFG_SYS_INT_FLASH_ENABLE), %d0
movec %d0, %FLASHBAR
jmp _after_flashbar_copy.L /* Force jump to absolute address */
_flashbar_setup_end:
nop
_after_flashbar_copy:
#else
/* Setup code to initialize FLASHBAR, if start from external Memory */
move.l #(CFG_SYS_INT_FLASH_BASE + CFG_SYS_INT_FLASH_ENABLE), %d0
movec %d0, %FLASHBAR
#endif /* (CONFIG_TEXT_BASE == CFG_SYS_INT_FLASH_BASE) */
#endif
#endif
/*
* if we come from a pre-loader we have no exception table and
* therefore no VBR to set
*/
#if !defined(CONFIG_MONITOR_IS_IN_RAM)
#if defined(CONFIG_M5282) && (CONFIG_TEXT_BASE == CFG_SYS_INT_FLASH_BASE)
move.l #CFG_SYS_INT_FLASH_BASE, %d0
#else
move.l #CFG_SYS_FLASH_BASE, %d0
#endif
movec %d0, %VBR
#endif
#ifdef CONFIG_M5275
/* set MBAR address + valid flag */
move.l #(CFG_SYS_MBAR + 1), %d0
move.l %d0, 0x40000000
/* movec %d0, %MBAR */
/* Initialize RAMBAR: locate SRAM and validate it */
move.l #(CFG_SYS_INIT_RAM_ADDR + 0x21), %d0
movec %d0, %RAMBAR1
#endif
/* initialize general use internal ram */
move.l #0, %d0
move.l #(ICACHE_STATUS), %a1 /* icache */
move.l #(DCACHE_STATUS), %a2 /* icache */
move.l %d0, (%a1)
move.l %d0, (%a2)
/* put relocation table address to a5 */
move.l #__got_start, %a5
/* setup stack initially on top of internal static ram */
move.l #(CFG_SYS_INIT_RAM_ADDR + CFG_SYS_INIT_RAM_SIZE), %sp
/*
* if configured, malloc_f arena will be reserved first,
* then (and always) gd struct space will be reserved
*/
move.l %sp, -(%sp)
move.l #board_init_f_alloc_reserve, %a1
jsr (%a1)
/* update stack and frame-pointers */
move.l %d0, %sp
move.l %sp, %fp
/* initialize reserved area */
move.l %d0, -(%sp)
move.l #board_init_f_init_reserve, %a1
jsr (%a1)
/* run low-level CPU init code (from flash) */
move.l #cpu_init_f, %a1
jsr (%a1)
/* run low-level board init code (from flash) */
clr.l %sp@-
move.l #board_init_f, %a1
jsr (%a1)
/* board_init_f() does not return */
/******************************************************************************/
/*
* void relocate_code(addr_sp, gd, addr_moni)
*
* This "function" does not return, instead it continues in RAM
* after relocating the monitor code.
*
* r3 = dest
* r4 = src
* r5 = length in bytes
* r6 = cachelinesize
*/
.globl relocate_code
relocate_code:
link.w %a6,#0
move.l 8(%a6), %sp /* set new stack pointer */
move.l 12(%a6), %d0 /* Save copy of Global Data pointer */
move.l 16(%a6), %a0 /* Save copy of Destination Address */
move.l #CONFIG_SYS_MONITOR_BASE, %a1
move.l #__init_end, %a2
move.l %a0, %a3
/* copy the code to RAM */
1:
move.l (%a1)+, (%a3)+
cmp.l %a1,%a2
bgt.s 1b
/*
* We are done. Do not return, instead branch to second part of board
* initialization, now running from RAM.
*/
move.l %a0, %a1
add.l #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1
jmp (%a1)
in_ram:
clear_bss:
/*
* Now clear BSS segment
*/
move.l %a0, %a1
add.l #(_sbss - CONFIG_SYS_MONITOR_BASE),%a1
move.l %a0, %d1
add.l #(_ebss - CONFIG_SYS_MONITOR_BASE),%d1
6:
clr.l (%a1)+
cmp.l %a1,%d1
bgt.s 6b
/*
* fix got table in RAM
*/
move.l %a0, %a1
add.l #(__got_start - CONFIG_SYS_MONITOR_BASE),%a1
move.l %a1,%a5 /* fix got pointer register a5 */
move.l %a0, %a2
add.l #(__got_end - CONFIG_SYS_MONITOR_BASE),%a2
7:
move.l (%a1),%d1
sub.l #_start,%d1
add.l %a0,%d1
move.l %d1,(%a1)+
cmp.l %a2, %a1
bne 7b
/* calculate relative jump to board_init_r in ram */
move.l %a0, %a1
add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1
/* set parameters for board_init_r */
move.l %a0,-(%sp) /* dest_addr */
move.l %d0,-(%sp) /* gd */
jsr (%a1)
/******************************************************************************/
/* exception code */
.globl _fault
_fault:
bra _fault
.globl _exc_handler
_exc_handler:
SAVE_ALL
movel %sp,%sp@-
bsr exc_handler
addql #4,%sp
RESTORE_ALL
.globl _int_handler
_int_handler:
SAVE_ALL
movel %sp,%sp@-
bsr int_handler
addql #4,%sp
RESTORE_ALL
/******************************************************************************/
.align 4
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