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riscv: set pmp configuration if kernel is running in M-mode 

When the kernel is running in S-mode, the expectation is that the
bootloader or SBI layer will configure the PMP to allow the kernel to
access physical memory.  But, when the kernel is running in M-mode and is
started with the ELF "loader", there's probably no bootloader or SBI layer
involved to configure the PMP.  Thus, we need to configure the PMP
ourselves to enable the kernel to access all regions.

Signed-off-by: Greentime Hu <greentime.hu@sifive.com>
Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Greentime Hu 2020-01-09 11:17:40 +08:00 committed by Palmer Dabbelt
parent 11a48a5a18
commit c68a903229
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2 changed files with 18 additions and 0 deletions
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12
arch/riscv/include/asm/csr.h
View File

@ -72,6 +72,16 @@
#define EXC_LOAD_PAGE_FAULT 13
#define EXC_STORE_PAGE_FAULT 15
/* PMP configuration */
#define PMP_R 0x01
#define PMP_W 0x02
#define PMP_X 0x04
#define PMP_A 0x18
#define PMP_A_TOR 0x08
#define PMP_A_NA4 0x10
#define PMP_A_NAPOT 0x18
#define PMP_L 0x80
/* symbolic CSR names: */
#define CSR_CYCLE 0xc00
#define CSR_TIME 0xc01
@ -100,6 +110,8 @@
#define CSR_MCAUSE 0x342
#define CSR_MTVAL 0x343
#define CSR_MIP 0x344
#define CSR_PMPCFG0 0x3a0
#define CSR_PMPADDR0 0x3b0
#define CSR_MHARTID 0xf14
#ifdef CONFIG_RISCV_M_MODE

6
arch/riscv/kernel/head.S
View File

@ -58,6 +58,12 @@ _start_kernel:
/* Reset all registers except ra, a0, a1 */
call reset_regs
/* Setup a PMP to permit access to all of memory. */
li a0, -1
csrw CSR_PMPADDR0, a0
li a0, (PMP_A_NAPOT | PMP_R | PMP_W | PMP_X)
csrw CSR_PMPCFG0, a0
/*
* The hartid in a0 is expected later on, and we have no firmware
* to hand it to us.