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c67b09bd2c
This patch introduces platform APIs to initialise and print a character on a designated crash console. For the FVP platform, PL011_UART0 is the designated crash console. The platform porting guide is also updated to document the new APIs. Change-Id: I5e97d8762082e0c88c8c9bbb479353eac8f11a66
219 lines
7.2 KiB
ArmAsm
219 lines
7.2 KiB
ArmAsm
/*
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* Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <arch.h>
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#include <asm_macros.S>
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#include <bl_common.h>
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#include <gic_v2.h>
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#include <pl011.h>
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#include "../drivers/pwrc/fvp_pwrc.h"
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#include "../fvp_def.h"
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.globl platform_get_entrypoint
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.globl plat_secondary_cold_boot_setup
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.globl platform_mem_init
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.globl plat_report_exception
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.globl plat_crash_console_init
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.globl plat_crash_console_putc
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.macro fvp_choose_gicmmap param1, param2, x_tmp, w_tmp, res
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ldr \x_tmp, =VE_SYSREGS_BASE + V2M_SYS_ID
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ldr \w_tmp, [\x_tmp]
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ubfx \w_tmp, \w_tmp, #SYS_ID_BLD_SHIFT, #SYS_ID_BLD_LENGTH
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cmp \w_tmp, #BLD_GIC_VE_MMAP
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csel \res, \param1, \param2, eq
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.endm
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/* -----------------------------------------------------
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* void plat_secondary_cold_boot_setup (void);
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*
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* This function performs any platform specific actions
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* needed for a secondary cpu after a cold reset e.g
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* mark the cpu's presence, mechanism to place it in a
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* holding pen etc.
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* TODO: Should we read the PSYS register to make sure
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* that the request has gone through.
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* -----------------------------------------------------
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*/
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func plat_secondary_cold_boot_setup
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/* ---------------------------------------------
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* Power down this cpu.
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* TODO: Do we need to worry about powering the
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* cluster down as well here. That will need
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* locks which we won't have unless an elf-
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* loader zeroes out the zi section.
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* ---------------------------------------------
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*/
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mrs x0, mpidr_el1
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ldr x1, =PWRC_BASE
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str w0, [x1, #PPOFFR_OFF]
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/* ---------------------------------------------
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* Deactivate the gic cpu interface as well
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* ---------------------------------------------
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*/
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ldr x0, =VE_GICC_BASE
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ldr x1, =BASE_GICC_BASE
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fvp_choose_gicmmap x0, x1, x2, w2, x1
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mov w0, #(IRQ_BYP_DIS_GRP1 | FIQ_BYP_DIS_GRP1)
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orr w0, w0, #(IRQ_BYP_DIS_GRP0 | FIQ_BYP_DIS_GRP0)
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str w0, [x1, #GICC_CTLR]
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/* ---------------------------------------------
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* There is no sane reason to come out of this
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* wfi so panic if we do. This cpu will be pow-
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* ered on and reset by the cpu_on pm api
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* ---------------------------------------------
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*/
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dsb sy
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wfi
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cb_panic:
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b cb_panic
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/* -----------------------------------------------------
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* void platform_get_entrypoint (unsigned int mpid);
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*
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* Main job of this routine is to distinguish between
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* a cold and warm boot.
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* On a cold boot the secondaries first wait for the
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* platform to be initialized after which they are
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* hotplugged in. The primary proceeds to perform the
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* platform initialization.
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* On a warm boot, each cpu jumps to the address in its
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* mailbox.
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*
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* TODO: Not a good idea to save lr in a temp reg
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* TODO: PSYSR is a common register and should be
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* accessed using locks. Since its not possible
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* to use locks immediately after a cold reset
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* we are relying on the fact that after a cold
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* reset all cpus will read the same WK field
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* -----------------------------------------------------
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*/
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func platform_get_entrypoint
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mov x9, x30 // lr
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mov x2, x0
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ldr x1, =PWRC_BASE
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str w2, [x1, #PSYSR_OFF]
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ldr w2, [x1, #PSYSR_OFF]
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ubfx w2, w2, #PSYSR_WK_SHIFT, #PSYSR_WK_MASK
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cmp w2, #WKUP_PPONR
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beq warm_reset
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cmp w2, #WKUP_GICREQ
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beq warm_reset
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mov x0, #0
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b exit
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warm_reset:
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/* ---------------------------------------------
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* A per-cpu mailbox is maintained in the tru-
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* sted DRAM. Its flushed out of the caches
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* after every update using normal memory so
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* its safe to read it here with SO attributes
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* ---------------------------------------------
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*/
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ldr x10, =TZDRAM_BASE + MBOX_OFF
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bl platform_get_core_pos
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lsl x0, x0, #CACHE_WRITEBACK_SHIFT
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ldr x0, [x10, x0]
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cbz x0, _panic
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exit:
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ret x9
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_panic: b _panic
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/* -----------------------------------------------------
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* void platform_mem_init (void);
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*
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* Zero out the mailbox registers in the TZDRAM. The
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* mmu is turned off right now and only the primary can
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* ever execute this code. Secondaries will read the
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* mailboxes using SO accesses. In short, BL31 will
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* update the mailboxes after mapping the tzdram as
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* normal memory. It will flush its copy after update.
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* BL1 will always read the mailboxes with the MMU off
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* -----------------------------------------------------
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*/
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func platform_mem_init
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ldr x0, =TZDRAM_BASE + MBOX_OFF
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mov w1, #PLATFORM_CORE_COUNT
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loop:
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str xzr, [x0], #CACHE_WRITEBACK_GRANULE
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subs w1, w1, #1
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b.gt loop
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ret
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/* ---------------------------------------------
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* void plat_report_exception(unsigned int type)
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* Function to report an unhandled exception
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* with platform-specific means.
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* On FVP platform, it updates the LEDs
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* to indicate where we are
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* ---------------------------------------------
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*/
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func plat_report_exception
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mrs x1, CurrentEl
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lsr x1, x1, #MODE_EL_SHIFT
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lsl x1, x1, #SYS_LED_EL_SHIFT
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lsl x0, x0, #SYS_LED_EC_SHIFT
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mov x2, #(SECURE << SYS_LED_SS_SHIFT)
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orr x0, x0, x2
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orr x0, x0, x1
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mov x1, #VE_SYSREGS_BASE
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add x1, x1, #V2M_SYS_LED
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str w0, [x1]
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ret
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/* Define a crash console for the plaform */
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#define FVP_CRASH_CONSOLE_BASE PL011_UART0_BASE
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/* ---------------------------------------------
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* int plat_crash_console_init(void)
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* Function to initialize the crash console
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* without a C Runtime to print crash report.
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* Clobber list : x0, x1, x2
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* ---------------------------------------------
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*/
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func plat_crash_console_init
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mov_imm x0, FVP_CRASH_CONSOLE_BASE
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mov_imm x1, PL011_UART0_CLK_IN_HZ
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mov_imm x2, PL011_BAUDRATE
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b console_core_init
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/* ---------------------------------------------
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* int plat_crash_console_putc(void)
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* Function to print a character on the crash
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* console without a C Runtime.
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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_imm x1, FVP_CRASH_CONSOLE_BASE
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b console_core_putc
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