From a3c174ee4c08d1d5e7a89ce187f52e3c0807a7eb Mon Sep 17 00:00:00 2001
From: stefan <stefan@s00.xyz>
Date: Sun, 23 Apr 2023 17:00:14 -0400
Subject: memory detection

---
 sys/include/asm.h    |  6 ++++++
 sys/include/dev.h    | 32 +++++++++++++++++++++++++++++++-
 sys/include/kalloc.h |  2 +-
 sys/include/sbi.h    |  8 ++++++++
 sys/include/vm.h     |  6 ++++++
 5 files changed, 52 insertions(+), 2 deletions(-)
 create mode 100644 sys/include/vm.h

(limited to 'sys/include')

diff --git a/sys/include/asm.h b/sys/include/asm.h
index 0995f88..d345712 100644
--- a/sys/include/asm.h
+++ b/sys/include/asm.h
@@ -53,4 +53,10 @@ read_tp(void)
 	return x;
 }
 
+static inline void 
+csrw_satp(uint64_t x)
+{
+	asm volatile("csrw satp, %0" : : "r"(x));
+}
+
 #endif /* _ASM_H */ 
diff --git a/sys/include/dev.h b/sys/include/dev.h
index b8bfef8..657c04c 100644
--- a/sys/include/dev.h
+++ b/sys/include/dev.h
@@ -2,7 +2,37 @@
 #define _DEV_H
 
 #include <libfdt.h>
+#include <stdint.h> 
 
-void dev_init(struct fdt_header* fdt);
+enum { DT_MMUTYPE_SV32, DT_MMUTYPE_SV39, DT_MMUTYPE_SV48 };
+
+struct _reg {
+	fdt64_t address;
+	fdt64_t size;
+};
+/* unflattend device tree */ 
+struct devicetree {
+	const char *compat;
+	const char *model;
+	int nproc;
+	/* main cpu, monitor/alternative cores will be ignored for now */
+	struct {
+		short mmu_type;
+		const char *isa;
+		unsigned int freq;
+	} cpu;
+	struct {
+		uintptr_t origin;
+	 	uintptr_t size;
+	} memory;
+	struct {
+		unsigned int freq;
+		const char *compat;
+		int interrupt;
+		struct _reg reg;
+	} uart;
+};
+
+struct devicetree dev_init(struct fdt_header* fdt);
 
 #endif /* _DEV_H */
diff --git a/sys/include/kalloc.h b/sys/include/kalloc.h
index 10adbda..5553d94 100644
--- a/sys/include/kalloc.h
+++ b/sys/include/kalloc.h
@@ -7,7 +7,7 @@ void *kzalloc(void);
 
 void kfree(void *);
 
-void kalloc_init(void);
+void kalloc_init(size_t);
 
 void walkfree(void);
 
diff --git a/sys/include/sbi.h b/sys/include/sbi.h
index 94c3749..86ca295 100644
--- a/sys/include/sbi.h
+++ b/sys/include/sbi.h
@@ -1,6 +1,8 @@
 #ifndef _SBI_H
 #define _SBI_H
 
+#include <stdint.h> 
+
 struct sbiret {
 	long err;
 	long val;
@@ -58,6 +60,12 @@ sbi_console_putchar(int c)
 	sbi_ecall(1, 0, c, 0, 0, 0, 0, 0);
 }
 
+static inline void 
+sbi_debug_console_write_byte(uint8_t byte)
+{
+	sbi_ecall(0x4442434E, 0x2, 'c', 0, 0, 0, 0, 0);
+}
+
 static inline void
 sbi_shutdown(void)
 {
diff --git a/sys/include/vm.h b/sys/include/vm.h
new file mode 100644
index 0000000..1883ea7
--- /dev/null
+++ b/sys/include/vm.h
@@ -0,0 +1,6 @@
+#ifndef _VM_H
+#define _VM_H
+
+void vminit(void);
+
+#endif /* _VM_H */
-- 
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