From c10e3fe5f9a14de3f001a6b007b7d9f117858dff Mon Sep 17 00:00:00 2001 From: Himanshu Chauhan Date: Thu, 19 Jan 2023 20:48:24 +0530 Subject: [PATCH] firmware: Add RW section offset in scratch Add the RW section offset, provided by _fw_rw_offset symbol, to the scratch structure. This will be used to program separate pmp entry for RW section. Signed-off-by: Himanshu Chauhan Reviewed-by: Anup Patel --- firmware/fw_base.S | 8 ++++++++ include/sbi/sbi_scratch.h | 24 ++++++++++++++---------- 2 files changed, 22 insertions(+), 10 deletions(-) diff --git a/firmware/fw_base.S b/firmware/fw_base.S index 3f622b3..e04b683 100644 --- a/firmware/fw_base.S +++ b/firmware/fw_base.S @@ -298,6 +298,12 @@ _scratch_init: sub a5, t3, a4 REG_S a4, SBI_SCRATCH_FW_START_OFFSET(tp) REG_S a5, SBI_SCRATCH_FW_SIZE_OFFSET(tp) + + /* Store R/W section's offset in scratch space */ + lla a4, __fw_rw_offset + REG_L a5, 0(a4) + REG_S a5, SBI_SCRATCH_FW_RW_OFFSET(tp) + /* Store next arg1 in scratch space */ MOV_3R s0, a0, s1, a1, s2, a2 call fw_next_arg1 @@ -519,6 +525,8 @@ _link_start: RISCV_PTR FW_TEXT_START _link_end: RISCV_PTR _fw_reloc_end +__fw_rw_offset: + RISCV_PTR _fw_rw_offset .section .entry, "ax", %progbits .align 3 diff --git a/include/sbi/sbi_scratch.h b/include/sbi/sbi_scratch.h index 40a3bc9..2966188 100644 --- a/include/sbi/sbi_scratch.h +++ b/include/sbi/sbi_scratch.h @@ -18,26 +18,28 @@ #define SBI_SCRATCH_FW_START_OFFSET (0 * __SIZEOF_POINTER__) /** Offset of fw_size member in sbi_scratch */ #define SBI_SCRATCH_FW_SIZE_OFFSET (1 * __SIZEOF_POINTER__) +/** Offset (in sbi_scratch) of the R/W Offset */ +#define SBI_SCRATCH_FW_RW_OFFSET (2 * __SIZEOF_POINTER__) /** Offset of next_arg1 member in sbi_scratch */ -#define SBI_SCRATCH_NEXT_ARG1_OFFSET (2 * __SIZEOF_POINTER__) +#define SBI_SCRATCH_NEXT_ARG1_OFFSET (3 * __SIZEOF_POINTER__) /** Offset of next_addr member in sbi_scratch */ -#define SBI_SCRATCH_NEXT_ADDR_OFFSET (3 * __SIZEOF_POINTER__) +#define SBI_SCRATCH_NEXT_ADDR_OFFSET (4 * __SIZEOF_POINTER__) /** Offset of next_mode member in sbi_scratch */ -#define SBI_SCRATCH_NEXT_MODE_OFFSET (4 * __SIZEOF_POINTER__) +#define SBI_SCRATCH_NEXT_MODE_OFFSET (5 * __SIZEOF_POINTER__) /** Offset of warmboot_addr member in sbi_scratch */ -#define SBI_SCRATCH_WARMBOOT_ADDR_OFFSET (5 * __SIZEOF_POINTER__) +#define SBI_SCRATCH_WARMBOOT_ADDR_OFFSET (6 * __SIZEOF_POINTER__) /** Offset of platform_addr member in sbi_scratch */ -#define SBI_SCRATCH_PLATFORM_ADDR_OFFSET (6 * __SIZEOF_POINTER__) +#define SBI_SCRATCH_PLATFORM_ADDR_OFFSET (7 * __SIZEOF_POINTER__) /** Offset of hartid_to_scratch member in sbi_scratch */ -#define SBI_SCRATCH_HARTID_TO_SCRATCH_OFFSET (7 * __SIZEOF_POINTER__) +#define SBI_SCRATCH_HARTID_TO_SCRATCH_OFFSET (8 * __SIZEOF_POINTER__) /** Offset of trap_exit member in sbi_scratch */ -#define SBI_SCRATCH_TRAP_EXIT_OFFSET (8 * __SIZEOF_POINTER__) +#define SBI_SCRATCH_TRAP_EXIT_OFFSET (9 * __SIZEOF_POINTER__) /** Offset of tmp0 member in sbi_scratch */ -#define SBI_SCRATCH_TMP0_OFFSET (9 * __SIZEOF_POINTER__) +#define SBI_SCRATCH_TMP0_OFFSET (10 * __SIZEOF_POINTER__) /** Offset of options member in sbi_scratch */ -#define SBI_SCRATCH_OPTIONS_OFFSET (10 * __SIZEOF_POINTER__) +#define SBI_SCRATCH_OPTIONS_OFFSET (11 * __SIZEOF_POINTER__) /** Offset of extra space in sbi_scratch */ -#define SBI_SCRATCH_EXTRA_SPACE_OFFSET (11 * __SIZEOF_POINTER__) +#define SBI_SCRATCH_EXTRA_SPACE_OFFSET (12 * __SIZEOF_POINTER__) /** Maximum size of sbi_scratch (4KB) */ #define SBI_SCRATCH_SIZE (0x1000) @@ -53,6 +55,8 @@ struct sbi_scratch { unsigned long fw_start; /** Size (in bytes) of firmware linked to OpenSBI library */ unsigned long fw_size; + /** Offset (in bytes) of the R/W section */ + unsigned long fw_rw_offset; /** Arg1 (or 'a1' register) of next booting stage for this HART */ unsigned long next_arg1; /** Address of next booting stage for this HART */ -- 2.7.4