platforms: add support for qemu-riscv32-virt

Signed-off-by: Jose Martins <josemartins90@gmail.com>
bao-project · May 23, 2024 · 5861033 · 5861033
1 parent 9f8bfe5
commit 5861033
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Showing 5 changed files with 15 additions and 1 deletion.
diff --git a/src/platform/qemu-riscv32-virt/inc b/src/platform/qemu-riscv32-virt/inc
@@ -0,0 +1 @@
+../qemu-riscv64-virt/inc
diff --git a/src/platform/qemu-riscv32-virt/objects.mk b/src/platform/qemu-riscv32-virt/objects.mk
@@ -0,0 +1 @@
+../qemu-riscv64-virt/objects.mk
diff --git a/src/platform/qemu-riscv32-virt/platform.mk b/src/platform/qemu-riscv32-virt/platform.mk
@@ -0,0 +1,2 @@
+ARCH_SUB:=riscv32
+include $(current_directory)/../qemu-riscv64-virt/platform.mk
diff --git a/src/platform/qemu-riscv32-virt/virt_desc.c b/src/platform/qemu-riscv32-virt/virt_desc.c
@@ -0,0 +1 @@
+../qemu-riscv64-virt/virt_desc.c
diff --git a/src/platform/qemu-riscv64-virt/virt_desc.c b/src/platform/qemu-riscv64-virt/virt_desc.c
@@ -6,6 +6,15 @@
 #include <platform.h>
 #include <interrupts.h>
 
+#if RV32
+// We use only 1 GiB for the rv32, due to limitations on how the physical memory must
+// be identity mapped by the hypervisor and the fact that the hypervisor reserves for
+// itsel the upper GB of the 4GB address space.
+#define QEMU_VIRT_MEM_REG_SIZE (0x40000000 - 0x200000)
+#else
+#define QEMU_VIRT_MEM_REG_SIZE (0x100000000 - 0x200000)
+#endif
+
 struct platform platform = {
 
     .cpu_num = 4,
@@ -14,7 +23,7 @@ struct platform platform = {
     .regions =  (struct mem_region[]) {
         {
             .base = 0x80200000,
-            .size = 0x100000000 - 0x200000,
+            .size = QEMU_VIRT_MEM_REG_SIZE,
         },
     },