(nuttx) 02/03: mpfs_entrypoints.c: Open all memory from PMP for hart before booting

[acassis]

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acassis pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/nuttx.git

commit 598e1c6512207e94a68dd5b580aeaf4cb61e1168
Author: Ville Juven <ville.ju...@unikie.com>
AuthorDate: Tue Oct 17 15:33:51 2023 +0300

    mpfs_entrypoints.c: Open all memory from PMP for hart before booting
    
    Open PMP before the hart payload starts to execute
---
 arch/risc-v/src/mpfs/mpfs_entrypoints.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/risc-v/src/mpfs/mpfs_entrypoints.c 
b/arch/risc-v/src/mpfs/mpfs_entrypoints.c
index c0c4d65cb8..f6d301cc0c 100644
--- a/arch/risc-v/src/mpfs/mpfs_entrypoints.c
+++ b/arch/risc-v/src/mpfs/mpfs_entrypoints.c
@@ -33,6 +33,8 @@
 
 #include <sys/types.h>
 
+#include "riscv_internal.h"
+
 /****************************************************************************
  * Extern Function Declarations
  ****************************************************************************/
@@ -45,6 +47,10 @@ extern void mpfs_opensbi_prepare_hart(void);
 
 #define ENTRYPT_CNT sizeof(g_app_entrypoints) / sizeof(g_app_entrypoints[0])
 
+/* Default PMP permissions */
+
+#define PMP_DEFAULT_PERM (PMPCFG_A_NAPOT | PMPCFG_R | PMPCFG_W | PMPCFG_X)
+
 /****************************************************************************
  * Private Data
  ****************************************************************************/
@@ -88,6 +94,11 @@ void mpfs_jump_to_app(void)
   __asm__ __volatile__
     (
       "csrr a0, mhartid\n"                   /* Hart ID */
+      "li   t0, -1\n"                        /* Open the whole SoC */
+      "csrw pmpaddr0, t0\n"
+      "li   t0, %0\n"                        /* Grant RWX permissions */
+      "csrw pmpcfg0, t0\n"
+      "csrw pmpcfg2, zero\n"
 #ifdef CONFIG_MPFS_OPENSBI
       "ld   t0, g_hart_use_sbi\n"            /* Load sbi usage bitmask */
       "srl  t0, t0, a0\n"                    /* Shift right by this hart */
@@ -101,6 +112,9 @@ void mpfs_jump_to_app(void)
       "add  t0, t0, t1\n"                    /* Index in table */
       "ld   t0, 0(t0)\n"                     /* Load the address from table */
       "jr   t0\n"                            /* Jump to entrypoint */
+      :
+      : "i" (PMP_DEFAULT_PERM)
+      :
     );
 }