1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * Startup Code for MIPS32 CPU-core
5 * Copyright (c) 2003 Wolfgang Denk <wd@denx.de>
8 #include <asm-offsets.h>
11 #include <asm/regdef.h>
12 #include <asm/mipsregs.h>
14 #ifndef CONFIG_SYS_INIT_SP_ADDR
15 #define CONFIG_SYS_INIT_SP_ADDR (CONFIG_SYS_SDRAM_BASE + \
16 CONFIG_SYS_INIT_SP_OFFSET)
24 # define STATUS_SET ST0_KX
30 MTC0 zero, CP0_WATCHLO,\sel
31 mtc0 t1, CP0_WATCHHI,\sel
32 mfc0 t0, CP0_WATCHHI,\sel
37 .macro uhi_mips_exception
38 move k0, t9 # preserve t9 in k0
39 move k1, a0 # preserve a0 in k1
40 li t9, 15 # UHI exception operation
41 li a0, 0 # Use hard register context
42 sdbbp 1 # Invoke UHI operation
47 PTR_LI t1, CONFIG_SYS_INIT_SP_ADDR
48 and sp, t1, t0 # force 16 byte alignment
50 sp, sp, GD_SIZE # reserve space for gd
51 and sp, sp, t0 # force 16 byte alignment
52 move k0, sp # save gd pointer
53 #if CONFIG_VAL(SYS_MALLOC_F_LEN) && \
54 !CONFIG_IS_ENABLED(INIT_STACK_WITHOUT_MALLOC_F)
55 li t2, CONFIG_VAL(SYS_MALLOC_F_LEN)
57 sp, sp, t2 # reserve space for early malloc
58 and sp, sp, t0 # force 16 byte alignment
70 #if CONFIG_VAL(SYS_MALLOC_F_LEN) && \
71 !CONFIG_IS_ENABLED(INIT_STACK_WITHOUT_MALLOC_F)
72 PTR_S sp, GD_MALLOC_BASE(k0) # gd->malloc_base offset
77 /* U-Boot entry point */
79 mtc0 zero, CP0_COUNT # clear cp0 count for most accurate boot timing
81 #if defined(CONFIG_MIPS_INSERT_BOOT_CONFIG)
83 * Store some board-specific boot configuration. This is used by some
84 * MIPS systems like Malta.
87 .word CONFIG_MIPS_BOOT_CONFIG_WORD0
88 .word CONFIG_MIPS_BOOT_CONFIG_WORD1
91 #if defined(CONFIG_ROM_EXCEPTION_VECTORS)
93 * Exception vector entry points. When running from ROM, an exception
94 * cannot be handled. Halt execution and transfer control to debugger,
98 /* TLB refill, 32 bit task */
102 /* XTLB refill, 64 bit task */
106 /* Cache error exception */
110 /* General exception */
114 /* Catch interrupt exceptions */
118 /* EJTAG debug exception */
126 #if __mips_isa_rev >= 6
127 mfc0 t0, CP0_CONFIG, 5
128 and t0, t0, MIPS_CONF5_VP
133 mfc0 t0, CP0_GLOBALNUMBER
136 #ifdef CONFIG_ARCH_BMIPS
137 1: mfc0 t0, CP0_DIAGNOSTIC, 3
138 and t0, t0, (1 << 31)
140 1: mfc0 t0, CP0_EBASE
141 and t0, t0, MIPS_EBASE_CPUNUM
144 /* Hang if this isn't the first CPU in the system */
151 /* Init CP0 Status */
152 4: mfc0 t0, CP0_STATUS
154 or t0, ST0_BEV | ST0_ERL | STATUS_SET
158 * Check whether CP0 Config1 is implemented. If not continue
159 * with legacy Watch register initialization.
166 * Check WR bit in CP0 Config1 to determine if Watch registers
169 mfc0 t0, CP0_CONFIG, 1
174 /* Clear Watch Status bits and disable watch exceptions */
175 li t1, 0x7 # Clear I, R and W conditions
188 MTC0 zero, CP0_WATCHLO
189 mtc0 zero, CP0_WATCHHI
192 /* Clear WP, IV and SW interrupts */
195 /* Clear timer interrupt (CP0_COUNT cleared on branch to 'reset') */
196 mtc0 zero, CP0_COMPARE
198 #ifdef CONFIG_MIPS_CACHE_DISABLE
200 PTR_LA t9, mips_cache_disable
205 #ifdef CONFIG_MIPS_CM
206 PTR_LA t9, mips_cm_map
211 #ifdef CONFIG_MIPS_INIT_STACK_IN_SRAM
212 #ifdef CONFIG_MIPS_SRAM_INIT
213 /* Initialize the SRAM first */
214 PTR_LA t9, mips_sram_init
219 /* Set up initial stack and global data */
222 # ifdef CONFIG_DEBUG_UART
223 /* Earliest point to set up debug uart */
224 PTR_LA t9, debug_uart_init
230 #ifndef CONFIG_SKIP_LOWLEVEL_INIT
231 # ifdef CONFIG_SYS_MIPS_CACHE_INIT_RAM_LOAD
232 /* Initialize any external memory */
233 PTR_LA t9, lowlevel_init
239 #ifdef CONFIG_MIPS_MACH_EARLY_INIT
240 bal mips_mach_early_init
244 #ifdef CONFIG_MIPS_CACHE_SETUP
245 /* Initialize caches... */
246 PTR_LA t9, mips_cache_reset
251 #ifndef CONFIG_SKIP_LOWLEVEL_INIT
252 # ifndef CONFIG_SYS_MIPS_CACHE_INIT_RAM_LOAD
253 /* Initialize any external memory */
254 PTR_LA t9, lowlevel_init
260 #ifndef CONFIG_MIPS_INIT_STACK_IN_SRAM
261 /* Set up initial stack and global data */
264 # ifdef CONFIG_DEBUG_UART
265 /* Earliest point to set up debug uart */
266 PTR_LA t9, debug_uart_init
272 move a0, zero # a0 <-- boot_flags = 0
273 PTR_LA t9, board_init_f