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lib: sbi: Map/Unmap debug console shared memory buffers

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With Smepmp enabled, it is necessary for shared memory from
S/U mode to be mapped/unmapped before and after read/write
of the memory region. This patch maps the debug console
shared memory before accessing it.

Signed-off-by: Himanshu Chauhan <hchauhan@ventanamicro.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Himanshu Chauhan 2023-07-12 10:04:36 +05:30 • committed by Anup Patel
parent 6e44ef686a
commit 0ad866067d
1 changed files with 3 additions and 0 deletions
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3
lib/sbi/sbi_ecall_dbcn.c
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@ -14,6 +14,7 @@
#include <sbi/sbi_ecall_interface.h>
#include <sbi/sbi_trap.h>
#include <sbi/riscv_asm.h>
#include <sbi/sbi_hart.h>
static int sbi_ecall_dbcn_handler(unsigned long extid, unsigned long funcid,
const struct sbi_trap_regs *regs,
@ -46,10 +47,12 @@ static int sbi_ecall_dbcn_handler(unsigned long extid, unsigned long funcid,
regs->a1, regs->a0, smode,
SBI_DOMAIN_READ|SBI_DOMAIN_WRITE))
return SBI_ERR_INVALID_PARAM;
sbi_hart_map_saddr(regs->a1, regs->a0);
if (funcid == SBI_EXT_DBCN_CONSOLE_WRITE)
*out_val = sbi_nputs((const char *)regs->a1, regs->a0);
else
*out_val = sbi_ngets((char *)regs->a1, regs->a0);
sbi_hart_unmap_saddr();
return 0;
case SBI_EXT_DBCN_CONSOLE_WRITE_BYTE:
sbi_putc(regs->a0);