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lib: sbi: Add separate entries for firmware RX and RW regions

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Add two entries for firmware in the root domain:

1. TEXT: fw_start to _fw_rw_offset with RX permissions
2. DATA: _fw_rw_offset to fw_size with RW permissions

These permissions are still not enforced from M-mode but lay
the ground work for enforcing them for M-mode. SU-mode don't
have any access to these regions.

Sample output:
 Domain0 Region01  : 0x0000000080000000-0x000000008001ffff M: (R,X) S/U: ()
 Domain0 Region02  : 0x0000000080020000-0x000000008003ffff M: (R,W) S/U: ()

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 20:48:26 +05:30 • committed by Anup Patel
parent b666760bfa
commit 230278dcf1
1 changed files with 22 additions and 2 deletions
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24
lib/sbi/sbi_domain.c
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@ -638,12 +638,32 @@ int sbi_domain_init(struct sbi_scratch *scratch, u32 cold_hartid)
u32 i;
const struct sbi_platform *plat = sbi_platform_ptr(scratch);
if (scratch->fw_rw_offset == 0 ||
(scratch->fw_rw_offset & (scratch->fw_rw_offset - 1)) != 0) {
sbi_printf("%s: fw_rw_offset is not a power of 2 (0x%lx)\n",
__func__, scratch->fw_rw_offset);
return SBI_EINVAL;
}
if ((scratch->fw_start & (scratch->fw_rw_offset - 1)) != 0) {
sbi_printf("%s: fw_start and fw_rw_offset not aligned\n",
__func__);
return SBI_EINVAL;
}
/* Root domain firmware memory region */
sbi_domain_memregion_init(scratch->fw_start, scratch->fw_size,
SBI_DOMAIN_MEMREGION_M_RWX,
sbi_domain_memregion_init(scratch->fw_start, scratch->fw_rw_offset,
(SBI_DOMAIN_MEMREGION_M_READABLE |
SBI_DOMAIN_MEMREGION_M_EXECUTABLE),
&root_fw_region);
domain_memregion_initfw(&root_memregs[root_memregs_count++]);
sbi_domain_memregion_init((scratch->fw_start + scratch->fw_rw_offset),
(scratch->fw_size - scratch->fw_rw_offset),
(SBI_DOMAIN_MEMREGION_M_READABLE |
SBI_DOMAIN_MEMREGION_M_WRITABLE),
&root_memregs[root_memregs_count++]);
/* Root domain allow everything memory region */
sbi_domain_memregion_init(0, ~0UL,
(SBI_DOMAIN_MEMREGION_READABLE |