Add MBR (Master boot record) (closes #19)

Makefile.am

@@ -58,6 +58,10 @@ if WITH_FRAMEBUFFER
 libkernaux_a_SOURCES += src/framebuffer.c
 endif
 
+if WITH_MBR
+libkernaux_a_SOURCES += src/mbr.c
+endif
+
 if WITH_MULTIBOOT2
 libkernaux_a_SOURCES += \
 	src/multiboot2/enums_to_str.c \

README.md

@@ -46,6 +46,7 @@ API
   * [Page Frame Allocator](/include/kernaux/pfa.h) *(work in progress)*
     * [Example](/examples/pfa.c)
 * Data formats
+  * [Master Boot Record](/include/kernaux/mbr.h) *(work in progress)*
   * [Multiboot 2 (GRUB 2) information parser](/include/kernaux/multiboot2.h) *(work in progress)*
   * Stivale 2 (Limine) information parser *(planned)*
   * [ELF utils](/include/kernaux/elf.h) *(work in progress)*
@@ -96,6 +97,7 @@ are some non-default options:
 * `--with[out]-console`
 * `--with[out]-elf`
 * `--with[out]-framebuffer`
+* `--with[out]-mbr`
 * `--with[out]-multiboot2`
 * `--with[out]-pfa`
 * `--with[out]-units`

configure.ac

@@ -23,6 +23,7 @@ AC_ARG_WITH(  [cmdline],     AS_HELP_STRING([--without-cmdline],     [without co
 AC_ARG_WITH(  [console],     AS_HELP_STRING([--without-console],     [without serial console]))
 AC_ARG_WITH(  [elf],         AS_HELP_STRING([--without-elf],         [without ELF utils]))
 AC_ARG_WITH(  [framebuffer], AS_HELP_STRING([--without-framebuffer], [without framebuffer]))
+AC_ARG_WITH(  [mbr],         AS_HELP_STRING([--without-mbr],         [without Master Boot Record]))
 AC_ARG_WITH(  [multiboot2],  AS_HELP_STRING([--without-multiboot2],  [without Multiboot 2 information parser]))
 AC_ARG_WITH(  [pfa],         AS_HELP_STRING([--without-pfa],         [without Page Frame Allocator]))
 AC_ARG_WITH(  [units],       AS_HELP_STRING([--without-units],       [without measurement units utils]))
@@ -67,6 +68,7 @@ AM_CONDITIONAL([WITH_CMDLINE],      [test "$with_cmdline"      != no])
 AM_CONDITIONAL([WITH_CONSOLE],      [test "$with_console"      != no])
 AM_CONDITIONAL([WITH_ELF],          [test "$with_elf"          != no])
 AM_CONDITIONAL([WITH_FRAMEBUFFER],  [test "$with_framebuffer"  != no])
+AM_CONDITIONAL([WITH_MBR],          [test "$with_mbr"          != no])
 AM_CONDITIONAL([WITH_MULTIBOOT2],   [test "$with_multiboot2"   != no])
 AM_CONDITIONAL([WITH_PFA],          [test "$with_pfa"          != no])
 AM_CONDITIONAL([WITH_UNITS],        [test "$with_units"        != no])
@@ -93,6 +95,7 @@ AS_IF([test "$with_cmdline"       != no], [AC_DEFINE([WITH_CMDLINE],
 AS_IF([test "$with_console"       != no], [AC_DEFINE([WITH_CONSOLE],              [1], [with serial console])])
 AS_IF([test "$with_elf"           != no], [AC_DEFINE([WITH_ELF],                  [1], [with ELF utils])])
 AS_IF([test "$with_framebuffer"   != no], [AC_DEFINE([WITH_FRAMEBUFFER],          [1], [with framebuffer])])
+AS_IF([test "$with_mbr"           != no], [AC_DEFINE([WITH_MBR],                  [1], [with Master Boot Record])])
 AS_IF([test "$with_multiboot2"    != no], [AC_DEFINE([WITH_MULTIBOOT2],           [1], [with Multiboot 2 information parser])])
 AS_IF([test "$with_pfa"           != no], [AC_DEFINE([WITH_PFA],                  [1], [with Page Frame Allocator])])
 AS_IF([test "$with_units",        != no], [AC_DEFINE([WITH_UNITS],                [1], [with measurement units utils])])

include/Makefile.am

@@ -13,6 +13,7 @@ nobase_include_HEADERS = \
 	kernaux/framebuffer.h \
 	kernaux/itoa.h \
 	kernaux/libc.h \
+	kernaux/mbr.h \
 	kernaux/multiboot2.h \
 	kernaux/pfa.h \
 	kernaux/printf.h \

include/kernaux.h

@@ -12,6 +12,7 @@
 #include <kernaux/elf.h>
 #include <kernaux/framebuffer.h>
 #include <kernaux/itoa.h>
+#include <kernaux/mbr.h>
 #include <kernaux/multiboot2.h>
 #include <kernaux/pfa.h>
 #include <kernaux/printf.h>

include/kernaux/mbr.h

@@ -0,0 +1,45 @@
+#ifndef KERNAUX_INCLUDED_MBR
+#define KERNAUX_INCLUDED_MBR
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+
+#define KERNAUX_MBR_SIZE 512
+#define KERNAUX_MBR_MAGIC 0xAA55
+#define KERNAUX_MBR_ENTRIES 4
+
+#define KERNAUX_MBR_BOOTSTRAP_SIZE \
+    (KERNAUX_MBR_SIZE - sizeof(struct KernAux_Mbr_Info))
+
+struct KernAux_Mbr_Entry {
+    uint8_t  drive_attributes;
+    unsigned start_chs_address : 24;
+    uint8_t  partition_type;
+    unsigned last_chs_address : 24;
+    uint32_t start_lba;
+    uint32_t sectors_count;
+}
+__attribute__((packed));
+
+struct KernAux_Mbr_Info {
+    uint32_t disk_id;
+    uint16_t reserved;
+    struct KernAux_Mbr_Entry entries[KERNAUX_MBR_ENTRIES];
+    uint16_t magic;
+}
+__attribute__((packed));
+
+struct KernAux_Mbr {
+    uint8_t bootstrap[KERNAUX_MBR_BOOTSTRAP_SIZE];
+    struct KernAux_Mbr_Info info;
+}
+__attribute__((packed));
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

src/mbr.c

@@ -0,0 +1,5 @@
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <kernaux/mbr.h>