tests: Multiboot mmap test case

This adds a test case for Multiboot memory map in the tests/multiboot directory, where future i386 test kernels can be dropped. Because this requires an x86 build host and an installed 32 bit libgcc, the test is not part of a regular 'make check'.

The reference output for the test is verified against test runs of the same multiboot kernel booted by some GRUB 0.97.

---
 tests/multiboot/Makefile    |  18 ++++++
 tests/multiboot/libc.c      | 139 ++++++++++++++++++++++++++++++++++++++++++++
 tests/multiboot/libc.h      |  61 +++++++++++++++++++
 tests/multiboot/link.ld     |  19 ++++++
 tests/multiboot/mmap.c      |  56 ++++++++++++++++++
 tests/multiboot/mmap.out    |  93 +++++++++++++++++++++++++++++
 tests/multiboot/multiboot.h |  66 +++++++++++++++++++++
 tests/multiboot/run_test.sh |  81 ++++++++++++++++++++++++++
 tests/multiboot/start.S     |  51 ++++++++++++++++
 9 files changed, 584 insertions(+)
 create mode 100644 tests/multiboot/Makefile
 create mode 100644 tests/multiboot/libc.c
 create mode 100644 tests/multiboot/libc.h
 create mode 100644 tests/multiboot/link.ld
 create mode 100644 tests/multiboot/mmap.c
 create mode 100644 tests/multiboot/mmap.out
 create mode 100644 tests/multiboot/multiboot.h
 create mode 100755 tests/multiboot/run_test.sh
 create mode 100644 tests/multiboot/start.S

new file mode 100644
index 0000000..34cdd81
@@ -0,0 +1,18 @@
+CC=gcc
+CCFLAGS=-m32 -Wall -Wextra -Werror -fno-stack-protector -nostdinc -fno-builtin
+ASFLAGS=-m32
+
+LD=ld
+LDFLAGS=-melf_i386 -T link.ld
+LIBS=$(shell $(CC) $(CCFLAGS) -print-libgcc-file-name)
+
+all: mmap.elf
+
+mmap.elf: start.o mmap.o libc.o
+	$(LD) $(LDFLAGS) -o $@ $^ $(LIBS)
+
+%.o: %.c
+	$(CC) $(CCFLAGS) -c -o $@ $^
+
+%.o: %.S
+	$(CC) $(ASFLAGS) -c -o $@ $^

new file mode 100644
index 0000000..3d49b58
@@ -0,0 +1,19 @@
+ENTRY(_start)
+
+SECTIONS
+{
+    . = 0x100000;
+    .text : {
+        *(multiboot)
+        *(.text)
+    }
+    .data ALIGN(4096) : {
+        *(.data)
+    }
+    .rodata ALIGN(4096) : {
+        *(.rodata)
+    }
+    .bss ALIGN(4096) : {
+        *(.bss)
+    }
+}

1.8.1.4