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lib: sbi: Map/Unmap debug console shared memory buffers
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>
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@ -14,6 +14,7 @@
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#include <sbi/sbi_ecall_interface.h>
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#include <sbi/sbi_trap.h>
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#include <sbi/riscv_asm.h>
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#include <sbi/sbi_hart.h>
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static int sbi_ecall_dbcn_handler(unsigned long extid, unsigned long funcid,
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const struct sbi_trap_regs *regs,
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@ -46,10 +47,12 @@ static int sbi_ecall_dbcn_handler(unsigned long extid, unsigned long funcid,
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regs->a1, regs->a0, smode,
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SBI_DOMAIN_READ|SBI_DOMAIN_WRITE))
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return SBI_ERR_INVALID_PARAM;
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sbi_hart_map_saddr(regs->a1, regs->a0);
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if (funcid == SBI_EXT_DBCN_CONSOLE_WRITE)
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*out_val = sbi_nputs((const char *)regs->a1, regs->a0);
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else
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*out_val = sbi_ngets((char *)regs->a1, regs->a0);
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sbi_hart_unmap_saddr();
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return 0;
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case SBI_EXT_DBCN_CONSOLE_WRITE_BYTE:
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sbi_putc(regs->a0);
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