GitHub-Mirror/opensbi
2
0
Fork 0
mirror of https://github.com/Fishwaldo/opensbi.git synced 2025-03-15 19:31:32 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

lib: reset: Move fdt_reset_init into generic_early_init

Browse source 
The fdt_reset_thead driver needs to modify the __reset_thead_csr_stub
text region for the secondary harts booting. After that, the
sbi_hart_pmp_configure may lock down the text region with M_READABLE &
M_EXECUTABLE attributes in the future. Currently, the M_READABLE &
M_EXECUtABLE have no effect on m-mode, the L-bit in pmpcfg csr is
useless for the current opensbi scenario. See:

Priv-isa-spec 3.7.1.2. Locking and Privilege Mode
When the L bit is clear, any M-mode access matching the PMP entry will
succeed; the R/W/X permissions apply only to S and U modes.

That's why current fdt_reset_thead could still work well after commit:
230278dcf1 ("lib: sbi: Add separate entries for firmware RX and RW
regions"). So this patch fixes up a fake bug for the M-mode permission
setting of the future.

Fixes: 230278dcf1 ("lib: sbi: Add separate entries for firmware RX and RW regions")
Link: http://lists.infradead.org/pipermail/opensbi/2023-June/005176.html
Reported-by: Jessica Clarke <jrtc27@jrtc27.com>
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Guo Ren 2023-06-18 11:07:16 -04:00 • committed by Anup Patel
parent d64942f0e4
commit 27c957a43b
1 changed files with 3 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
platform/generic/platform.c
View file

@ -143,6 +143,9 @@ static int generic_nascent_init(void)
static int generic_early_init(bool cold_boot)
{
if (cold_boot)
fdt_reset_init();
if (!generic_plat || !generic_plat->early_init)
return 0;
@ -154,9 +157,6 @@ static int generic_final_init(bool cold_boot)
void *fdt;
int rc;
if (cold_boot)
fdt_reset_init();
if (generic_plat && generic_plat->final_init) {
rc = generic_plat->final_init(cold_boot, generic_plat_match);
if (rc)