From dd825ef769c107d86b80ede076e90cca3cf303b2 Mon Sep 17 00:00:00 2001
From: Nathan Lee <me@nwlee.tech>
Date: Sun, 30 Aug 2026 20:23:28 -0500
Subject: add support for printk printers in the formatter

- todo: add support for size_t (currently, you can just cast to
  uintptr_t)
---
 kernel/common/log.c   | 28 ++++++++++++++++++++++++++++
 kernel/riscv/kernel.c |  3 +++
 2 files changed, 31 insertions(+)

(limited to 'kernel')

diff --git a/kernel/common/log.c b/kernel/common/log.c
index d75daeb..f65c165 100644
--- a/kernel/common/log.c
+++ b/kernel/common/log.c
@@ -1,3 +1,4 @@
+#include <sys/stddef.h>
 #include <sys/log.h>
 
 __attribute__((section(".ringbuf"), aligned(64)))
@@ -35,6 +36,29 @@ void put_uint(unsigned int value, unsigned int radix) {
         put_char(tmp[i]);
 }
 
+
+void put_ptr(uintptr_t value) {
+    char tmp[16];
+    const char digits[] = "0123456789abcdef";
+    int i = 0;
+
+    if (value == 0) {
+        put_char('0');
+        return;
+    }
+
+    while (value) {
+        tmp[i++] = digits[value % 16];
+        value /= 16;
+    }
+
+    put_char('0');
+    put_char('x');
+
+    while (i--)
+        put_char(tmp[i]);
+}
+
 void put_int(int value) {
     if (value < 0) {
         put_char('-');
@@ -79,6 +103,10 @@ void vprintk(const char *fmt, __builtin_va_list args) {
             put_uint(__builtin_va_arg(args, unsigned int), 16);
             break;
 
+        case 'p':
+            put_ptr(__builtin_va_arg(args, uintptr_t));
+            break;
+
         default:
             put_char('%');
             put_char(*fmt);
diff --git a/kernel/riscv/kernel.c b/kernel/riscv/kernel.c
index 665d7f4..46de696 100644
--- a/kernel/riscv/kernel.c
+++ b/kernel/riscv/kernel.c
@@ -49,6 +49,8 @@ struct kernel_info *discover_arch(void *fdt) {
     kernel_info->mem_start = (void *)base;
     kernel_info->mem_size = size;
 
+    printk("[I] DTB provided memory block addr %p size %p\n", base, (uintptr_t)size);
+
     
     uint8_t *initrd_reg = dt_get_prop(head, "initrd", &len);
     if (!initrd_reg || len < sizeof(uintptr_t) + sizeof(size_t)) {
@@ -62,6 +64,7 @@ struct kernel_info *discover_arch(void *fdt) {
     kernel_info->initrd_start = (void *)base;
     kernel_info->initrd_size = size;
 
+    printk("[I] DTB provided init ramdisk addr %p size %p\n", base, (uintptr_t)size);
 
     return kernel_info;
 }
-- 
cgit v1.2.3