Merge branch 'bob' of https://repo.or.cz/RPi-MMU-example into alice

# Conflicts:
#	.gitignore
#	PL0_test.ld
#	demo_functionality.c
#	interrupt_vector.S
#	interrupts.c
#	kernel.c
#	memory.h

1 files changed, 102 insertions, 0 deletions

diff --git a/atags.h b/atags.h
new file mode 100644
index 0000000..4b6879f
--- /dev/null
+++ b/atags.h
@@ -0,0 +1,102 @@
+#ifndef ATAGS_H
+#define ATAGS_H
+
+#include <stdint.h>
+
+#define ATAG_NONE      0x00000000
+#define ATAG_CORE      0x54410001
+#define ATAG_MEM       0x54410002
+#define ATAG_VIDEOTEXT 0x54410003
+#define ATAG_RAMDISK   0x54410004
+#define ATAG_INITRD2   0x54420005
+#define ATAG_SERIAL    0x54410006
+#define ATAG_REVISION  0x54410007
+#define ATAG_VIDEOLFB  0x54410008
+#define ATAG_CMDLINE   0x54410009
+
+struct atag_header
+{
+  uint32_t size;
+  uint32_t tag;
+};
+
+struct atag_core
+{
+  uint32_t flags;
+  uint32_t pagesize;
+  uint32_t rootdev;
+};
+
+struct atag_mem
+{
+  uint32_t size;
+  uint32_t start;
+};
+
+struct atag_videotext
+{
+  uint8_t  x;
+  uint8_t  y;
+  uint16_t video_page;
+  uint8_t  video_mode;
+  uint8_t  video_cols;
+  uint16_t video_ega_bx;
+  uint8_t  video_lines;
+  uint8_t  video_isvga;
+  uint16_t video_points;
+};
+
+struct atag_ramdisk
+{
+  uint32_t flags;
+  uint32_t size;
+  uint32_t start;
+};
+
+struct atag_initrd2
+{
+  uint32_t start;
+  uint32_t size;
+};
+
+struct atag_serialnr
+{
+  uint32_t low;
+  uint32_t high;
+};
+
+struct atag_revision
+{
+  uint32_t rev;
+};
+
+struct atag_videolfb
+{
+  uint16_t lfb_width;
+  uint16_t lfb_height;
+  uint16_t lfb_depth;
+  uint16_t lfb_linelength;
+  uint32_t lfb_base;
+  uint32_t lfb_size;
+  uint8_t  red_size;
+  uint8_t  red_pos;
+  uint8_t  green_size;
+  uint8_t  green_pos;
+  uint8_t  blue_size;
+  uint8_t  blue_pos;
+  uint8_t  rsvd_size;
+  uint8_t  rsvd_pos;
+};
+
+struct atag_cmdline
+{
+  char cmdline[1];
+};
+
+uint32_t find_memory_size(struct atag_header *atags);
+
+void print_tag(struct atag_header *tag);
+
+void print_atags(struct atag_header *atags);
+
+#endif // ATAGS_H