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firmware: Allow firmwares to provide next mode and options
This patch extends existing firmwares (i.e. fw_jump and fw_payload) to explicitly provide next mode and options to fw_base. We also introduce fw_save_info() which is called by fw_base very early on boot HART. This function can be used by existing firmwares (i.e. fw_jump and fw_payload) to save information passed by previous booting stage. Overall, this is a preparatory patch for implementing fw_dynamic. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel
Anup Patel
parent
243a5e0532
commit
25472de89e
3 changed files with 148 additions and 25 deletions
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@ -13,6 +13,20 @@
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#include <sbi/sbi_scratch.h>
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#include <sbi/sbi_trap.h>
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.macro MOV_3R __d0, __s0, __d1, __s1, __d2, __s2
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add \__d0, \__s0, zero
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add \__d1, \__s1, zero
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add \__d2, \__s2, zero
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.endm
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.macro MOV_5R __d0, __s0, __d1, __s1, __d2, __s2, __d3, __s3, __d4, __s4
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add \__d0, \__s0, zero
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add \__d1, \__s1, zero
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add \__d2, \__s2, zero
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add \__d3, \__s3, zero
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add \__d4, \__s4, zero
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.endm
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.align 3
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.section .entry, "ax", %progbits
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.globl _start
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@ -25,9 +39,15 @@ _start:
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csrr a6, CSR_MHARTID
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blt zero, a6, _wait_for_boot_hart
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/* Reset all registers for boot HART */
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li ra, 0
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call _reset_regs
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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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MOV_5R a0, s0, a1, s1, a2, s2, a3, s3, a4, s4
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/* Preload HART details
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* s7 -> HART Count
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* s8 -> HART Stack Size
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@ -59,6 +79,7 @@ _scratch_init:
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sub tp, tp, a5
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/* Initialize scratch space */
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/* Store fw_start and fw_size in scratch space */
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la a4, _fw_start
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la a5, _fw_end
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mul t0, s7, s8
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@ -66,27 +87,44 @@ _scratch_init:
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sub a5, a5, a4
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REG_S a4, SBI_SCRATCH_FW_START_OFFSET(tp)
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REG_S a5, SBI_SCRATCH_FW_SIZE_OFFSET(tp)
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/* Note: fw_next_arg1() uses a0, a1, and ra */
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/* Store next arg1 in scratch space */
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MOV_3R s0, a0, s1, a1, s2, a2
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call fw_next_arg1
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REG_S a0, SBI_SCRATCH_NEXT_ARG1_OFFSET(tp)
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/* Note: fw_next_addr() uses a0, a1, and ra */
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MOV_3R a0, s0, a1, s1, a2, s2
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/* Store next address in scratch space */
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MOV_3R s0, a0, s1, a1, s2, a2
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call fw_next_addr
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REG_S a0, SBI_SCRATCH_NEXT_ADDR_OFFSET(tp)
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li a4, PRV_S
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REG_S a4, SBI_SCRATCH_NEXT_MODE_OFFSET(tp)
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MOV_3R a0, s0, a1, s1, a2, s2
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/* Store next mode in scratch space */
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MOV_3R s0, a0, s1, a1, s2, a2
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call fw_next_mode
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REG_S a0, SBI_SCRATCH_NEXT_MODE_OFFSET(tp)
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MOV_3R a0, s0, a1, s1, a2, s2
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/* Store warm_boot address in scratch space */
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la a4, _start_warm
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REG_S a4, SBI_SCRATCH_WARMBOOT_ADDR_OFFSET(tp)
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/* Store platform address in scratch space */
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la a4, platform
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REG_S a4, SBI_SCRATCH_PLATFORM_ADDR_OFFSET(tp)
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/* Store hartid-to-scratch function address in scratch space */
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la a4, _hartid_to_scratch
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REG_S a4, SBI_SCRATCH_HARTID_TO_SCRATCH_OFFSET(tp)
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/* Clear tmp0 in scratch space */
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REG_S zero, SBI_SCRATCH_TMP0_OFFSET(tp)
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/* Store firmware options in scratch space */
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MOV_3R s0, a0, s1, a1, s2, a2
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#ifdef FW_OPTIONS
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li a4, FW_OPTIONS
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REG_S a4, SBI_SCRATCH_OPTIONS_OFFSET(tp)
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#else
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REG_S zero, SBI_SCRATCH_OPTIONS_OFFSET(tp)
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add a4, zero, zero
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#endif
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call fw_options
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or a4, a4, a0
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REG_S a4, SBI_SCRATCH_OPTIONS_OFFSET(tp)
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MOV_3R a0, s0, a1, s1, a2, s2
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/* Move to next scratch space */
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add t1, t1, t2
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blt t1, s7, _scratch_init
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@ -99,12 +137,10 @@ _bss_zero:
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blt a4, a5, _bss_zero
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/* Override pervious arg1 */
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add s0, a0, zero
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add s1, a1, zero
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MOV_3R s0, a0, s1, a1, s2, a2
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call fw_prev_arg1
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add t1, a0, zero
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add a0, s0, zero
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add a1, s1, zero
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MOV_3R a0, s0, a1, s1, a2, s2
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beqz t1, _prev_arg1_override_done
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add a1, t1, zero
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_prev_arg1_override_done:
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@ -122,13 +158,12 @@ _prev_arg1_override_done:
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li a3, ~(__SIZEOF_POINTER__ - 1)
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li a4, 0xff
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/* t1 = destination FDT start address */
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add s0, a0, zero
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add s1, a1, zero
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MOV_3R s0, a0, s1, a1, s2, a2
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call fw_next_arg1
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add t1, a0, zero
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add a0, s0, zero
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add a1, s1, zero
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MOV_3R a0, s0, a1, s1, a2, s2
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beqz t1, _fdt_reloc_done
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beq t1, a1, _fdt_reloc_done
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and t1, t1, a3
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/* t0 = source FDT start address */
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add t0, a1, zero
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@ -188,6 +223,7 @@ _wait_for_boot_hart:
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beqz a5, _wait_for_boot_hart
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_start_warm:
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/* Reset all registers for non-boot HARTs */
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li ra, 0
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call _reset_regs
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@ -430,7 +466,7 @@ _reset_regs:
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/* flush the instruction cache */
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fence.i
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/* Reset all registers except ra, a0,a1 */
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/* Reset all registers except ra, a0, a1 and a2 */
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li sp, 0
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li gp, 0
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li tp, 0
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@ -439,7 +475,6 @@ _reset_regs:
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li t2, 0
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li s0, 0
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li s1, 0
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li a2, 0
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li a3, 0
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li a4, 0
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li a5, 0
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@ -9,19 +9,37 @@
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#include "fw_base.S"
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.align 3
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.section .entry, "ax", %progbits
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.global fw_save_info
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/*
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* We can only use a0, a1, a2, a3, and a4 registers here.
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* The a0, a1, and a2 registers will be same as passed by
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* previous booting stage.
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* Nothing to be returned here.
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*/
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fw_save_info:
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ret
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.align 3
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.section .entry, "ax", %progbits
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.global fw_prev_arg1
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/*
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* We can only use a0, a1, and a2 registers here.
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* The previous arg1 should be returned in 'a0'.
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*/
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fw_prev_arg1:
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/* We return previous arg1 in 'a0' */
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add a0, zero, zero
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ret
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.align 3
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.section .entry, "ax", %progbits
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.global fw_next_arg1
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/*
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* We can only use a0, a1, and a2 registers here.
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* The next arg1 should be returned in 'a0'.
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*/
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fw_next_arg1:
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/* We return next arg1 in 'a0' */
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#ifdef FW_JUMP_FDT_ADDR
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li a0, FW_JUMP_FDT_ADDR
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#else
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@ -32,12 +50,38 @@ fw_next_arg1:
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.align 3
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.section .entry, "ax", %progbits
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.global fw_next_addr
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/*
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* We can only use a0, a1, and a2 registers here.
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* The next address should be returned in 'a0'.
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*/
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fw_next_addr:
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/* We return next address in 'a0' */
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la a0, _jump_addr
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REG_L a0, (a0)
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ret
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.align 3
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.section .entry, "ax", %progbits
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.global fw_next_mode
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/*
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* We can only use a0, a1, and a2 registers here.
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* The next address should be returned in 'a0'
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*/
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fw_next_mode:
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li a0, PRV_S
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ret
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.align 3
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.section .entry, "ax", %progbits
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.global fw_options
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/*
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* We can only use a0, a1, and a2 registers here.
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* The 'a4' register will have default options.
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* The next address should be returned in 'a0'.
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*/
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fw_options:
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add a0, zero, zero
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ret
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#ifndef FW_JUMP_ADDR
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#error "Must define FW_JUMP_ADDR"
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#endif
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@ -9,11 +9,26 @@
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#include "fw_base.S"
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.align 4
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.align 3
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.section .entry, "ax", %progbits
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.global fw_save_info
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/*
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* We can only use a0, a1, a2, a3, and a4 registers here.
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* The a0, a1, and a2 registers will be same as passed by
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* previous booting stage.
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* Nothing to be returned here.
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*/
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fw_save_info:
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ret
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.align 3
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.section .entry, "ax", %progbits
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.global fw_prev_arg1
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/*
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* We can only use a0, a1, and a2 registers here.
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* The previous arg1 should be returned in 'a0'.
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*/
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fw_prev_arg1:
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/* We return previous arg1 in 'a0' */
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#ifdef FW_PAYLOAD_FDT_PATH
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la a0, fdt_bin
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#else
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@ -21,11 +36,14 @@ fw_prev_arg1:
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#endif
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ret
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.align 4
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.align 3
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.section .entry, "ax", %progbits
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.global fw_next_arg1
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/*
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* We can only use a0, a1, and a2 registers here.
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* The next arg1 should be returned in 'a0'.
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*/
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fw_next_arg1:
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/* We return next arg1 in 'a0' */
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#ifdef FW_PAYLOAD_FDT_ADDR
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li a0, FW_PAYLOAD_FDT_ADDR
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#else
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@ -33,14 +51,40 @@ fw_next_arg1:
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#endif
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ret
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.align 4
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.align 3
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.section .entry, "ax", %progbits
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.global fw_next_addr
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/*
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* We can only use a0, a1, and a2 registers here.
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* The next address should be returned in 'a0'.
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*/
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fw_next_addr:
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/* We return next address in 'a0' */
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la a0, payload_bin
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ret
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.align 3
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.section .entry, "ax", %progbits
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.global fw_next_mode
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/*
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* We can only use a0, a1, and a2 registers here.
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* The next address should be returned in 'a0'.
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*/
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fw_next_mode:
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li a0, PRV_S
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ret
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.align 3
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.section .entry, "ax", %progbits
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.global fw_options
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/*
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* We can only use a0, a1, and a2 registers here.
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* The 'a4' register will have default options.
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* The next address should be returned in 'a0'.
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*/
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fw_options:
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add a0, zero, zero
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ret
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#ifdef FW_PAYLOAD_FDT_PATH
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.align 4
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.section .text, "ax", %progbits
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