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firmware: Add RW section offset in scratch

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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 <hchauhan@ventanamicro.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Himanshu Chauhan 2023-01-19 20:48:24 +05:30 • committed by Anup Patel
parent 2f40a99c9e
commit c10e3fe5f9
2 changed files with 22 additions and 10 deletions
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8
firmware/fw_base.S
View file

@ -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

24
include/sbi/sbi_scratch.h
View file

@ -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 */