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firmware: fw_base: Introduce optional fw_platform_init()
We add optional fw_platform_init() function which will allow platform specific code to update "struct sbi_platform platform" before it is used. The fw_platform_init() can be a regular C function so before callint it we: 1. zero-out BSS section 2. Setup temporary trap handler to catch bugs 3. Setup temporary stack pointer Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
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1 changed files with 33 additions and 8 deletions
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@ -160,6 +160,32 @@ _relocate_done:
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li ra, 0
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call _reset_regs
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/* Zero-out BSS */
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la s4, _bss_start
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la s5, _bss_end
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_bss_zero:
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REG_S zero, (s4)
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add s4, s4, __SIZEOF_POINTER__
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blt s4, s5, _bss_zero
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/* Setup temporary trap handler */
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la s4, _start_hang
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csrw CSR_MTVEC, s4
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/* Setup temporary stack */
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la s4, _fw_end
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li s5, (SBI_SCRATCH_SIZE * 2)
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add sp, s4, s5
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/*
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* Initialize platform
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* Note: The a0 to a4 registers passed to the
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* firmware are parameters to this function.
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*/
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MOV_5R s0, a0, s1, a1, s2, a2, s3, a3, s4, a4
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call fw_platform_init
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MOV_5R a0, s0, a1, s1, a2, s2, a3, s3, a4, s4
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/* Allow main firmware to save info */
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MOV_5R s0, a0, s1, a1, s2, a2, s3, a3, s4, a4
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call fw_save_info
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@ -245,14 +271,6 @@ _scratch_init:
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add t1, t1, t2
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blt t1, s7, _scratch_init
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/* Zero-out BSS */
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la a4, _bss_start
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la a5, _bss_end
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_bss_zero:
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REG_S zero, (a4)
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add a4, a4, __SIZEOF_POINTER__
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blt a4, a5, _bss_zero
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/* Override pervious arg1 */
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MOV_3R s0, a0, s1, a1, s2, a2
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call fw_prev_arg1
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@ -454,6 +472,13 @@ _start_hang:
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wfi
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j _start_hang
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.section .entry, "ax", %progbits
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.align 3
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.globl fw_platform_init
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.weak fw_platform_init
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fw_platform_init:
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ret
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.section .entry, "ax", %progbits
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.align 3
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.globl _trap_handler
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