165 lines
4.6 KiB
ArmAsm
165 lines
4.6 KiB
ArmAsm
/*
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* Copyright (c) 2021, Stephan Gerhold <stephan@gerhold.net>
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <arch.h>
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#include <asm_macros.S>
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#include <msm8916_mmap.h>
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#define APCS_TCM_START_ADDR 0x10
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#define APCS_TCM_REDIRECT_EN_0 BIT_32(0)
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.globl plat_crash_console_init
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.globl plat_crash_console_putc
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.globl plat_crash_console_flush
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.globl plat_panic_handler
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.globl plat_my_core_pos
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.globl plat_get_my_entrypoint
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.globl plat_reset_handler
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.globl platform_mem_init
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.globl msm8916_entry_point
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/* -------------------------------------------------
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* int plat_crash_console_init(void)
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* Initialize the crash console.
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* Out: x0 - 1 on success, 0 on error
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* Clobber list : x0 - x4
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* -------------------------------------------------
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*/
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func plat_crash_console_init
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mov x1, #BLSP_UART2_BASE
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/*
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* If the non-secure world has been actively using the UART there might
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* be still some characters left to be sent in the FIFO. In that case,
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* resetting the transmitter too early might cause all output to become
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* corrupted. To avoid that, try to flush (wait until FIFO empty) first.
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*/
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mov x4, lr
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bl console_uartdm_core_flush
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mov lr, x4
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mov x0, #1
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b console_uartdm_core_init
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endfunc plat_crash_console_init
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/* -------------------------------------------------
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* int plat_crash_console_putc(int c)
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* Print a character on the crash console.
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* In : w0 - character to be printed
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* Out: w0 - printed character on success
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* Clobber list : x1, x2
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* -------------------------------------------------
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*/
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func plat_crash_console_putc
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mov x1, #BLSP_UART2_BASE
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b console_uartdm_core_putc
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endfunc plat_crash_console_putc
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/* -------------------------------------------------
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* void plat_crash_console_flush(void)
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* Force a write of all buffered data that has not
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* been output.
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* Clobber list : x1, x2
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* -------------------------------------------------
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*/
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func plat_crash_console_flush
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mov x1, #BLSP_UART2_BASE
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b console_uartdm_core_flush
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endfunc plat_crash_console_flush
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/* -------------------------------------------------
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* void plat_panic_handler(void) __dead
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* Called when an unrecoverable error occurs.
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* -------------------------------------------------
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*/
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func plat_panic_handler
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/* Try to shutdown/reset */
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mov_imm x0, MPM_PS_HOLD
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str wzr, [x0]
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1: b 1b
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endfunc plat_panic_handler
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/* -------------------------------------------------
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* unsigned int plat_my_core_pos(void)
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* Out: x0 - index of the calling CPU
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* -------------------------------------------------
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*/
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func plat_my_core_pos
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/* There is just a single cluster so this is very simple */
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mrs x0, mpidr_el1
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and x0, x0, #MPIDR_CPU_MASK
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ret
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endfunc plat_my_core_pos
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/* -------------------------------------------------
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* uintptr_t plat_get_my_entrypoint(void)
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* Distinguish cold and warm boot and return warm boot
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* entry address if available.
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* Out: x0 - warm boot entry point or 0 on cold boot
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* -------------------------------------------------
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*/
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func plat_get_my_entrypoint
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ldr x0, msm8916_entry_point
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ret
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endfunc plat_get_my_entrypoint
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/* -------------------------------------------------
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* void plat_reset_handler(void)
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* Perform additional initialization after reset.
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* Clobber list : x0 - x18, x30
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* -------------------------------------------------
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*/
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func plat_reset_handler
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/*
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* Check if the CPU is running at the correct address.
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* During cold boot the CPU enters here at the wrong address
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* using the "boot remapper". (It remaps the BL31_BASE to
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* the CPU reset address 0x0).
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*/
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mov x0, #BL31_BASE
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adr x1, bl31_entrypoint
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cmp x0, x1
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b.ne _remapped_cold_boot
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/* Already running at correct address, just return directly */
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ret
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_remapped_cold_boot:
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/*
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* The previous boot stage seems to use the L2 cache as TCM.
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* Disable the TCM redirect before enabling caches to avoid
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* strange crashes.
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*/
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mov x2, #APCS_CFG
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ldr w3, [x2, #APCS_TCM_START_ADDR]
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and w3, w3, #~APCS_TCM_REDIRECT_EN_0
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str w3, [x2, #APCS_TCM_START_ADDR]
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/* Enter BL31 again at the real address */
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br x0
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endfunc plat_reset_handler
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/* -------------------------------------------------
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* void platform_mem_init(void)
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* Performs additional memory initialization early
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* in the boot process.
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* -------------------------------------------------
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*/
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func platform_mem_init
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/* Nothing to do here, all memory is already initialized */
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ret
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endfunc platform_mem_init
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.data
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.align 3
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/* -------------------------------------------------
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* Warm boot entry point for CPU. Set by PSCI code.
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* -------------------------------------------------
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*/
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msm8916_entry_point:
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.quad 0
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