fix warnings on 32bit riscv

+ Will most probably not work on 32bit, but nice to make 'portable'
  code.

6 files changed, 40 insertions, 20 deletions

diff --git a/arch/riscv32 b/arch/riscv32
new file mode 120000
index 0000000..11677ef
--- /dev/null
+++ b/arch/riscv32
@@ -0,0 +1 @@
+riscv64
\ No newline at end of file
diff --git a/arch/riscv64/config.h b/arch/riscv64/config.h
index 957f848..b52585b 100644
--- a/arch/riscv64/config.h
+++ b/arch/riscv64/config.h
@@ -14,11 +14,10 @@
 #define PM_STACK_SIZE   (SZ_256K)
 #define PM_STACK_TOP    (PM_STACK_BASE + PM_STACK_SIZE)
 
+#if __riscv_xlen == 64
+/* 64bit */
 #define VM_DMAP         (0xffffffc000000000) /* testing for now */
 #define VM_KERN         (VM_DMAP + SZ_256K)
-#define TMP_PTE         (-SZ_2G)
-#define ROOT_PTE        (0UL)
-#define ROOT_REGION     (SZ_4K)
 
 #define IO_PAGE         511UL
 #define KSTART_PAGE     256UL
@@ -32,3 +31,24 @@
 
 #define PROC_STACK_TOP  (SZ_256G)
 #define PROC_STACK_BASE (SZ_256G - SZ_1G)
+#else
+/* 32bit */
+/* TODO: figure this stuff out */
+#define VM_DMAP         (0x000000000)
+#define VM_KERN         (VM_DMAP + SZ_256K)
+#define ROOT_PTE        (0UL)
+#define ROOT_REGION     (SZ_4K)
+
+#define IO_PAGE         1023UL
+#define KSTART_PAGE     512UL
+#define CSTACK_PAGE     511UL
+
+/* assume Sv39, probably wouldn't be too difficult to use runtime parameters
+ * instead. First 4K is reserved for NULL, but I suppose it could be mapped
+ * later if *absolutely* necessary. */
+#define UVMEM_START     (SZ_4K)
+#define UVMEM_END       (SZ_4G - SZ_8M)
+
+#define PROC_STACK_TOP  (SZ_4G)
+#define PROC_STACK_BASE (SZ_4G - SZ_8M)
+#endif
diff --git a/arch/riscv64/include/types.h b/arch/riscv64/include/types.h
index 3e1c08b..59a2762 100644
--- a/arch/riscv64/include/types.h
+++ b/arch/riscv64/include/types.h
@@ -3,7 +3,7 @@
 
 #include <apos/types.h>
 
-typedef size_t vm_t;
-typedef size_t pm_t;
+typedef uintptr_t vm_t;
+typedef uintptr_t pm_t;
 
 #endif /* APOS_RISCV_TYPES_H */
diff --git a/arch/riscv64/include/vmem.h b/arch/riscv64/include/vmem.h
index 115f2b0..4446aef 100644
--- a/arch/riscv64/include/vmem.h
+++ b/arch/riscv64/include/vmem.h
@@ -4,6 +4,8 @@
 #include <apos/types.h>
 #include <apos/attrs.h>
 
+#define RISCV_NUM_LEAVES (4096 / sizeof(void *))
+
 #define VM_V (1 << 0)
 #define VM_R (1 << 1)
 #define VM_W (1 << 2)
@@ -19,8 +21,8 @@ enum mm_mode {
 	Sv32,
 };
 
-struct __packed vm_branch {
-	struct vm_branch *leaf[512];
+struct vm_branch {
+	struct vm_branch *leaf[RISCV_NUM_LEAVES];
 };
 
 #endif /* APOS_RISCV_VMAP_H */
diff --git a/arch/riscv64/init/init.c b/arch/riscv64/init/init.c
index f844dbb..b28c581 100644
--- a/arch/riscv64/init/init.c
+++ b/arch/riscv64/init/init.c
@@ -6,11 +6,7 @@
 #include <csr.h>
 
 /* assume 64 bit for now */
-struct __packed init_vmem {
-	int *leaf[512];
-};
-
-struct init_vmem *root_branch;
+struct vm_branch *root_branch;
 
 #define to_pte(a, f) (((a) >> 12) << 10 | (f))
 
@@ -20,23 +16,23 @@ void init_bootmem()
 	size_t flags = VM_V | VM_X | VM_R | VM_W;
 
 	extern char *__init_start;
-	root_branch = (struct init_vmem *)align_down(
-		(size_t)&__init_start - SZ_4K, SZ_4K);
+	root_branch = (struct vm_branch *)align_down(
+		(uintptr_t)&__init_start - SZ_4K, SZ_4K);
 
 	/* direct mapping (temp) */
 	for (size_t i = 0; i < CSTACK_PAGE; ++i)
-		root_branch->leaf[i] = (int *)to_pte(SZ_1G * i, flags);
+		root_branch->leaf[i] = (struct vm_branch *)to_pte(SZ_1G * i, flags);
 
 	/* kernel (also sort of direct mapping) */
 	flags |= VM_G;
 	for (size_t i = KSTART_PAGE; i < IO_PAGE; ++i)
 		root_branch->leaf[i] =
-			(int *)to_pte(RAM_BASE + SZ_1G * (i - 256), flags);
+			(struct vm_branch *)to_pte(RAM_BASE + SZ_1G * (i - 256), flags);
 
 	/* kernel IO, map to 0 for now, will be updated in the future */
-	root_branch->leaf[IO_PAGE] = (int *)to_pte(0, flags);
+	root_branch->leaf[IO_PAGE] = (struct vm_branch *)to_pte(0, flags);
 
-	csr_write(CSR_SATP, SATP_MODE_Sv39 | ((size_t)root_branch >> 12));
+	csr_write(CSR_SATP, SATP_MODE_Sv39 | ((uintptr_t)root_branch >> 12));
 }
 
 void move_kernel()
@@ -44,7 +40,7 @@ void move_kernel()
 	extern char *__init_end;
 	extern char *__kernel_size;
 
-	size_t sz = (size_t)&__kernel_size;
+	unsigned long sz = (unsigned long)&__kernel_size;
 	char *src = (char *)&__init_end;
 	char *dst = (char *)VM_KERN;
 	for (size_t i = 0; i < sz; ++i)
diff --git a/arch/riscv64/source.mk b/arch/riscv64/source.mk
index d1986d4..ce229a4 100644
--- a/arch/riscv64/source.mk
+++ b/arch/riscv64/source.mk
@@ -4,7 +4,8 @@ INIT_SOURCES	+= arch/riscv64/init/*.[cS]
 
 CLEANUP_CMD	:= ./arch/riscv64/conf/rmimage.sh
 
-ARCH_FLAGS	:= -mcmodel=medany
+ARCH_CFLAGS	:= -mcmodel=medany -fno-strict-aliasing
+ARCH_LDFLAGS	:=
 
 # llvm compilation doesn't seem to work, either bfd reads the object files wrong
 # and outputs incorrect symbols or lld handles relocations in a dumb way. Only