From 4130562b1555cabe441efe9420cebe12e7ed8d39 Mon Sep 17 00:00:00 2001
From: Benji Dial <benji@benjidial.net>
Date: Sat, 13 Jan 2024 16:43:49 -0500
Subject: application loading

---
 applications/init/main.cpp | 24 ++++++++++++++++++++++++
 applications/link.ld       | 38 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 62 insertions(+)
 create mode 100644 applications/init/main.cpp
 create mode 100644 applications/link.ld

(limited to 'applications')

diff --git a/applications/init/main.cpp b/applications/init/main.cpp
new file mode 100644
index 0000000..7aa2a38
--- /dev/null
+++ b/applications/init/main.cpp
@@ -0,0 +1,24 @@
+#include <mercury/syscall.hpp>
+
+using mercury::syscall::encoded_color;
+using mercury::syscall::color;
+
+encoded_color *fb;
+uint32_t fb_width;
+uint32_t fb_height;
+uint32_t fb_pitch;
+
+int main(int, char **) {
+  mercury::syscall::get_framebuffer(fb, fb_width, fb_height, fb_pitch);
+  for (uint32_t y = 0; y < fb_height; ++y)
+    for (uint32_t x = 0; x < fb_width; ++x) {
+       color c = {
+        .r = 0,
+        .g = (uint8_t)(y * 255 / fb_height),
+        .b = (uint8_t)(x * 255 / fb_width)
+      };
+      fb[y * fb_pitch + x] = mercury::syscall::encode_color(c);
+    }
+  mercury::syscall::draw_framebuffer();
+  return 0;
+}
diff --git a/applications/link.ld b/applications/link.ld
new file mode 100644
index 0000000..eaba220
--- /dev/null
+++ b/applications/link.ld
@@ -0,0 +1,38 @@
+OUTPUT_FORMAT(elf64-x86-64)
+OUTPUT_ARCH(i386:x86-64)
+
+ENTRY(_entry)
+
+PHDRS {
+  rx PT_LOAD FLAGS(5);
+  ro PT_LOAD FLAGS(4);
+  rw PT_LOAD FLAGS(6);
+}
+
+SECTIONS {
+
+  /* see also ../documentation/memory.txt */
+  . = 0x200000;
+
+  .text : {
+    *(.text .text.*)
+  } : rx
+
+  . = ALIGN(0x200000);
+
+  .rodata : {
+    *(.rodata .rodata.*)
+  } : ro
+
+  . = ALIGN(0x200000);
+
+  .data : {
+    *(.data .data.*)
+  } : rw
+
+  .bss : {
+    *(.bss .bss.*)
+    *(COMMON)
+  } : rw
+
+}
-- 
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