fdt: add pmp parsing helper

Signed-off-by: Chih-Min Chao <chihmin.chao@sifive.com>

2 files changed, 17 insertions, 1 deletions

diff --git a/riscv/dts.cc b/riscv/dts.cc
index c9daa96..3257976 100644
--- a/riscv/dts.cc
+++ b/riscv/dts.cc
@@ -44,6 +44,7 @@ std::string make_dts(size_t insns_per_rtc_tick, size_t cpu_hz,
          "      compatible = \"riscv\";\n"
          "      riscv,isa = \"" << procs[i]->get_isa_string() << "\";\n"
          "      mmu-type = \"riscv," << (procs[i]->get_max_xlen() <= 32 ? "sv32" : "sv48") << "\";\n"
+         "      riscv,pmpregions = <16>;\n"
          "      clock-frequency = <" << cpu_hz << ">;\n"
          "      CPU" << i << "_intc: interrupt-controller {\n"
          "        #interrupt-cells = <1>;\n"
@@ -227,3 +228,18 @@ int fdt_parse_clint(void *fdt, unsigned long *clint_addr,
 
   return 0;
 }
+
+int fdt_parse_pmp(void *fdt, unsigned long *pmp_num, const char *compatible)
+{
+  int nodeoffset, rc;
+
+  nodeoffset = fdt_node_offset_by_compatible(fdt, -1, compatible);
+  if (nodeoffset < 0)
+    return nodeoffset;
+
+  rc = fdt_get_node_addr_size(fdt, nodeoffset, pmp_num, NULL, "riscv,pmpregions");
+  if (rc < 0 || !pmp_num)
+    return -ENODEV;
+
+  return 0;
+}
diff --git a/riscv/dts.h b/riscv/dts.h
index cb3490d..ec27abc 100644
--- a/riscv/dts.h
+++ b/riscv/dts.h
@@ -15,5 +15,5 @@ std::string dts_compile(const std::string& dts);
 
 int fdt_parse_clint(void *fdt, unsigned long *clint_addr,
                     const char *compatible);
-
+int fdt_parse_pmp(void *fdt, unsigned long *pmp_num, const char *compatible);
 #endif