From 386ad4f82955d389ae347bc50f7efca5edb9d9a8 Mon Sep 17 00:00:00 2001
From: stefan <stefan@s00.xyz>
Date: Fri, 21 Apr 2023 21:56:45 -0400
Subject: actually got libfdt working

---
 sys/Makefile       |  3 +++
 sys/dev/dev_init.c | 22 ++++++++++++++++++++++
 sys/include/dev.h  |  8 ++++++++
 sys/sys/init.c     |  4 ++++
 sys/sys/printf.c   |  4 ++++
 5 files changed, 41 insertions(+)
 create mode 100644 sys/dev/dev_init.c
 create mode 100644 sys/include/dev.h

(limited to 'sys')

diff --git a/sys/Makefile b/sys/Makefile
index 385cf7a..970809f 100644
--- a/sys/Makefile
+++ b/sys/Makefile
@@ -13,6 +13,7 @@ SRC=\
     sys/printf.c\
     sys/mm/kalloc.c\
     sys/smp/spinlock.c\
+    dev/dev_init.c\
     
 
 ${BUILDDIR}/kernel.elf: ${SRC}
@@ -28,6 +29,8 @@ ${BUILDDIR}/kernel.elf: ${SRC}
 		-I ./include\
 		${CFLAGS} -T sys/kernel.lds ${LDFLAGS}\
 		-L../lib/libc/${BUILDDIR}/\
+		-L../lib/libfdt/${BUILDDIR}/\
+		-l:libfdt.a\
 		-l:libc.a\
 		-o $@
 
diff --git a/sys/dev/dev_init.c b/sys/dev/dev_init.c
new file mode 100644
index 0000000..fc70853
--- /dev/null
+++ b/sys/dev/dev_init.c
@@ -0,0 +1,22 @@
+#include <dev.h>
+#include <libfdt.h>
+#include <sbi.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+
+void
+dev_init(struct fdt_header *fdt)
+{
+	if (fdt_check_header(fdt) == 0) 
+		printf("[dev_init] valid fdt at %p\n", fdt);
+	else
+		printf("[dev_init] error: fdt_check_header()\n");
+
+	int offset = fdt_next_node(fdt, offset, 0);
+	do {
+		printf("[dev_init] found %s\n", fdt_get_name(fdt, offset, NULL));
+		offset = fdt_next_node(fdt, offset, 0);
+	} while (offset != -FDT_ERR_NOTFOUND);
+}
+
diff --git a/sys/include/dev.h b/sys/include/dev.h
new file mode 100644
index 0000000..b8bfef8
--- /dev/null
+++ b/sys/include/dev.h
@@ -0,0 +1,8 @@
+#ifndef _DEV_H
+#define _DEV_H
+
+#include <libfdt.h>
+
+void dev_init(struct fdt_header* fdt);
+
+#endif /* _DEV_H */
diff --git a/sys/sys/init.c b/sys/sys/init.c
index b21ac84..48aeb97 100644
--- a/sys/sys/init.c
+++ b/sys/sys/init.c
@@ -1,4 +1,6 @@
+#include <dev.h>
 #include <libfdt.h>
+#include <string.h>
 #include <kalloc.h>
 #include <spinlock.h>
 #include <stdio.h>
@@ -23,6 +25,8 @@ init(unsigned long hartid, struct fdt_header *fdt)
 	printf_init();
 	printf("done!\n");
 
+	dev_init(fdt);
+
 	printf("bringing up other harts...\n");
 	for (int i = 0; i < NPROC; ++i) {
 		if (i == hartid) { 
diff --git a/sys/sys/printf.c b/sys/sys/printf.c
index e8cc468..bff20bf 100644
--- a/sys/sys/printf.c
+++ b/sys/sys/printf.c
@@ -56,6 +56,7 @@ printptr(uint64_t x)
 		putchar(digits[x >> (sizeof(int64_t) * 8 - 4)]);
 }
 
+/* literally zero overflow checking (i am the best programmer of all time) */
 void
 printf(const char *fmt, ...) 
 {
@@ -90,6 +91,9 @@ printf(const char *fmt, ...)
 			case '%':
 				putchar('%');
 				break;
+			case 's':
+				puts(va_arg(ap, const char *));
+				break;
 		}
 	}
 	release(&mutex);
-- 
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