diff options
| author | Anup Patel <anup.patel@wdc.com> | 2020-04-26 12:01:28 +0300 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2020-05-01 08:03:02 +0300 |
| commit | 4d063538f0493916dc6263276c4c84f31446db41 (patch) | |
| tree | b5dfda0139ca79e3da7b16e84100e8ad74352f01 /firmware | |
| parent | 7cc6fa4d8a65e08048e1dd469087805ce89bf306 (diff) | |
| download | opensbi-4d063538f0493916dc6263276c4c84f31446db41.tar.xz | |
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>
Diffstat (limited to 'firmware')
| -rw-r--r-- | firmware/fw_base.S | 41 |
1 files changed, 33 insertions, 8 deletions
diff --git a/firmware/fw_base.S b/firmware/fw_base.S index 07edc74..5cb0dfa 100644 --- a/firmware/fw_base.S +++ b/firmware/fw_base.S @@ -160,6 +160,32 @@ _relocate_done: li ra, 0 call _reset_regs + /* Zero-out BSS */ + la s4, _bss_start + la s5, _bss_end +_bss_zero: + REG_S zero, (s4) + add s4, s4, __SIZEOF_POINTER__ + blt s4, s5, _bss_zero + + /* Setup temporary trap handler */ + la s4, _start_hang + csrw CSR_MTVEC, s4 + + /* Setup temporary stack */ + la s4, _fw_end + li s5, (SBI_SCRATCH_SIZE * 2) + add sp, s4, s5 + + /* + * Initialize platform + * Note: The a0 to a4 registers passed to the + * firmware are parameters to this function. + */ + MOV_5R s0, a0, s1, a1, s2, a2, s3, a3, s4, a4 + call fw_platform_init + MOV_5R a0, s0, a1, s1, a2, s2, a3, s3, a4, s4 + /* Allow main firmware to save info */ MOV_5R s0, a0, s1, a1, s2, a2, s3, a3, s4, a4 call fw_save_info @@ -245,14 +271,6 @@ _scratch_init: add t1, t1, t2 blt t1, s7, _scratch_init - /* Zero-out BSS */ - la a4, _bss_start - la a5, _bss_end -_bss_zero: - REG_S zero, (a4) - add a4, a4, __SIZEOF_POINTER__ - blt a4, a5, _bss_zero - /* Override pervious arg1 */ MOV_3R s0, a0, s1, a1, s2, a2 call fw_prev_arg1 @@ -456,6 +474,13 @@ _start_hang: .section .entry, "ax", %progbits .align 3 + .globl fw_platform_init + .weak fw_platform_init +fw_platform_init: + ret + + .section .entry, "ax", %progbits + .align 3 .globl _trap_handler _trap_handler: /* Swap TP and MSCRATCH */ |