initial commitmain

Signed-off-by: Chloe M. <chloe@aptel.org>

15 files changed, 540 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..2481e7f
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+*.bin
+*.o
+*.d
+*.rdar
+/out
diff --git a/boot/Makefile b/boot/Makefile
new file mode 100644
index 0000000..9f40b8a
--- /dev/null
+++ b/boot/Makefile
@@ -0,0 +1,11 @@
+#
+# Copyright (c) 2026, Apollo Telephone Laboratories.
+# Provided under the BSD-3 clause.
+#
+
+.PHONY: all
+all: machine
+
+.PHONY: machine
+machine:
+	cd $(CONFIG_TARGET_ARCH)/$(CONFIG_TARGET_BOARD); $(MAKE)
diff --git a/boot/amd64/generic/Makefile b/boot/amd64/generic/Makefile
new file mode 100644
index 0000000..c911fd7
--- /dev/null
+++ b/boot/amd64/generic/Makefile
@@ -0,0 +1,29 @@
+#
+# Copyright (c) 2026, Apollo Telephone Laboratories.
+# Provided under the BSD-3 clause.
+#
+
+.PHONY: all
+all: mbr biosboot stage3 image
+
+.PHONY: image
+image:
+	mkdir -p rdar_root
+	cat biosboot/biosboot.bin stage3/stage3.bin >rdar_root/s2.bin
+	cd rdar_root; rdar -i . -o ../bootar.rdar
+	rm -rf rdar_root
+	cat mbr/mbr.bin bootar.rdar >$(GLOBAL_PROJECT_ROOT)/out/ams.img
+	dd if=/dev/zero of=/tmp/zero-pad.tmp count=8 bs=512
+	cat /tmp/zero-pad.tmp >>$(GLOBAL_PROJECT_ROOT)/out/ams.img
+
+.PHONY: stage3
+stage3:
+	cd stage3; $(MAKE)
+
+.PHONY: biosboot
+biosboot:
+	cd biosboot; $(MAKE)
+
+.PHONY: mbr
+mbr:
+	cd mbr; $(MAKE)
diff --git a/boot/amd64/generic/biosboot/Makefile b/boot/amd64/generic/biosboot/Makefile
new file mode 100644
index 0000000..e9854be
--- /dev/null
+++ b/boot/amd64/generic/biosboot/Makefile
@@ -0,0 +1,15 @@
+#
+# Copyright (c) 2026, Apollo Telephone Laboratories.
+# Provided under the BSD-3 clause.
+#
+
+include ../mk/build.mk
+
+CFLAGS = $(INTERNAL_CFLAGS)
+
+.PHONY: all
+all: biosboot
+
+.PHONY: biosboot
+biosboot:
+	$(CC) $(CFLAGS) -Tlink.ld biosboot.S -o biosboot.bin
diff --git a/boot/amd64/generic/biosboot/biosboot.S b/boot/amd64/generic/biosboot/biosboot.S
new file mode 100644
index 0000000..bf2b004
--- /dev/null
+++ b/boot/amd64/generic/biosboot/biosboot.S
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2026, Apollo Telephone Laboratories.
+ * Provided under the BSD-3 clause.
+ */
+
+    .text
+    .code16
+    .globl _start
+_start:
+    cli
+    xor %ax, %ax
+    mov %ax, %ds
+    mov %ax, %es
+    mov %ax, %ss
+
+    lgdt gdtr
+    mov %cr0, %eax
+    or $1, %eax
+    mov %eax, %cr0
+    ljmp $0x08,$1f
+
+    .code32
+1:  mov $0x10, %ax
+    mov %ax, %es
+    mov %ax, %ss
+    mov %ax, %fs
+    mov %ax, %gs
+    mov %ax, %ds
+    jmp c_thunk
+
+gdt:
+.null:
+    .quad 0
+.code:
+    .word 0xFFFF
+    .word 0x0000
+    .byte 0x00
+    .byte 0b10011010
+    .byte 0b11001111
+    .byte 0x00
+.data:
+    .word 0xFFFF
+    .word 0x0000
+    .byte 0x00
+    .byte 0b10010010
+    .byte 0b11001111
+    .byte 0x00
+gdtr:
+    .word . - gdt - 1
+    .long gdt
+
+/* Fall-through : everything above this */
+c_thunk:
+    nop
diff --git a/boot/amd64/generic/biosboot/link.ld b/boot/amd64/generic/biosboot/link.ld
new file mode 100644
index 0000000..f039b2b
--- /dev/null
+++ b/boot/amd64/generic/biosboot/link.ld
@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2026, Apollo Telephone Laboratories.
+ * Provided under the BSD-3 clause.
+ */
+
+OUTPUT_FORMAT(binary)
+
+SECTIONS {
+    . = 0x7C00;
+
+    .text : {
+        *(.text)
+    }
+
+    .data : {
+        *(.data)
+    }
+
+    .rodata : {
+        *(.rodata)
+    }
+
+    .bss : {
+        *(.bss)
+    }
+}
diff --git a/boot/amd64/generic/mbr/Makefile b/boot/amd64/generic/mbr/Makefile
new file mode 100644
index 0000000..c9ae0dc
--- /dev/null
+++ b/boot/amd64/generic/mbr/Makefile
@@ -0,0 +1,15 @@
+#
+# Copyright (c) 2026, Apollo Telephone Laboratories.
+# Provided under the BSD-3 clause.
+#
+
+include ../mk/build.mk
+
+CFLAGS = $(INTERNAL_CFLAGS)
+
+.PHONY: all
+all: mbr
+
+.PHONY: mbr
+mbr:
+	$(CC) $(CFLAGS) -Tlink.ld mbr.S -o mbr.bin
diff --git a/boot/amd64/generic/mbr/link.ld b/boot/amd64/generic/mbr/link.ld
new file mode 100644
index 0000000..fbc3b21
--- /dev/null
+++ b/boot/amd64/generic/mbr/link.ld
@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2026, Apollo Telephone Laboratories.
+ * Provided under the BSD-3 clause.
+ */
+
+OUTPUT_FORMAT(binary)
+
+SECTIONS {
+    . = 0x00;
+
+    .text : {
+        *(.text)
+    }
+
+    .data : {
+        *(.data)
+    }
+
+    .rodata : {
+        *(.rodata)
+    }
+
+    .bss : {
+        *(.bss)
+    }
+}
diff --git a/boot/amd64/generic/mbr/mbr.S b/boot/amd64/generic/mbr/mbr.S
new file mode 100644
index 0000000..7cd7484
--- /dev/null
+++ b/boot/amd64/generic/mbr/mbr.S
@@ -0,0 +1,213 @@
+/*
+ * Copyright (c) 2026, Apollo Telephone Laboratories.
+ * Provided under the BSD-3 clause.
+ */
+
+#define BOOT_SEG       0x7C0    /* Segment we reside on startup */
+#define BOOT_RELOC_SEG 0x7A0    /* Relocation segment */
+#define RDAR_MAGIC     ">RDAR!"
+#define RDAR_MAGIC_LEN 6
+#define BOOT_PATH      "s2.bin"
+#define BOOT_PATH_LEN  6
+
+    .text
+    .code16
+_start:
+    ljmp $BOOT_SEG,$main
+main:
+    cli
+    cld
+
+    /* Set segment registers */
+    xor %ax, %ax
+    mov %ax, %fs
+    mov %ax, %gs
+    mov %ax, %ss
+    mov %ax, %es
+    mov $BOOT_SEG, %ax
+    mov %ax, %ds
+
+    /* Save the drive */
+    mov %dl, drive_num
+
+    /*
+     * The second stage bootloader expects to be loaded to 0x7C00 but since we are
+     * already executing at this address we'll need to relocate ourselves first before
+     * we clobber it.
+     */
+    mov $BOOT_SEG, %ax
+    mov %ax, %ds
+    mov $BOOT_RELOC_SEG, %ax
+    mov %ax, %es
+    xor %si, %si
+    xor %di, %di
+    mov $0x200, %cx
+    cld
+    rep movsb
+
+    jmp $BOOT_RELOC_SEG,$1f
+1:  mov $0x7C00, %sp
+
+    /* Load two sectors */
+    movw $2, dap_blkcnt
+    movl $1, dap_lba_low
+    call disk_read_lba
+
+    mov $BOOT_RELOC_SEG, %ax
+    mov %ax, %ds
+
+    /* Get stage2 */
+    call find_stage2
+
+    /* Obtain the data offset */
+    mov $BOOT_SEG, %ax
+    mov %ax, %ds
+    add $40, %si
+    movw (%si), %si
+
+    mov $BOOT_SEG, %ax
+    mov %ax, %ds
+    mov %ax, %es
+    xor %di, %di
+    mov $0x200, %cx
+    cld
+    rep movsb
+
+    /* Jump to stage 2 */
+    xor %ax, %ax
+    mov %ax, %ds
+    ljmp $0x0000,$0x7C00
+
+/*
+ * Write a character to the boot console
+ *
+ * %al:  Character to write
+ */
+putc:
+    mov $0x0E, %ah
+    xor %bh, %bh
+    int $0x10
+    ret
+
+/*
+ * Write a string to the boot console
+ *
+ * %si:  Pointer to string to write
+ */
+puts:
+    lodsb
+    or %al, %al
+    jz 1f
+    call putc
+    jmp puts
+1:  ret
+
+/*
+ * Locate stage2 on the disk
+ *
+ * Stage 2 data descriptor is returned in %SI
+ */
+find_stage2:
+    push %ds
+    push %es
+
+    /* Verify that magic is correct */
+    mov $BOOT_SEG, %ax
+    mov %ax, %ds
+    xor %bx, %bx    /* Tracks %SI */
+    xor %si, %si
+    mov $BOOT_RELOC_SEG, %ax
+    mov %ax, %es
+    mov $rdar_magic, %di
+    mov $RDAR_MAGIC_LEN, %cx
+    rep cmpsb
+    jne .bad_magic
+
+    /* Iterate every data descriptor */
+    clc              /* Carry set if found */
+1:  movw %ds:6, %cx  /* Add data descriptor size */
+    mov %bx, %si
+    mov %si, %dx
+    add %cx, %bx
+    mov $rdar_magic, %di
+    mov $RDAR_MAGIC_LEN, %cx
+    rep cmpsb
+    jne .not_found
+
+    /* Does the path match? */
+    mov %dx, %si
+    add $8, %si
+    mov $stage2_path, %di
+    mov $BOOT_PATH_LEN, %cx
+    rep cmpsb
+    jne 1b
+
+    mov %dx, %si
+    stc
+    pop %es
+    pop %ds
+    jnc .not_found
+    ret
+.not_found:
+    pop %ds
+    mov $not_found_msg, %si
+    call puts
+1:  cli
+    hlt
+    jmp 1b
+
+.bad_magic:
+    /* Restore %DS */
+    mov $BOOT_RELOC_SEG, %ax
+    mov %ax, %ds
+
+    mov $bad_magic_msg, %si
+    call puts
+1:  cli
+    hlt
+    jmp 1b
+
+/*
+ * Read sectors from the disk
+ */
+disk_read_lba:
+    pusha
+    mov $dap, %si
+    mov $0x42, %ah
+    mov drive_num, %dl
+    int $0x13
+    jc .error
+    popa
+    ret
+.error:
+    mov $disk_err_msg, %si
+    call puts
+1:  cli
+    hlt
+    jmp 1b
+
+/* Global stores */
+rdar_magic: .ascii RDAR_MAGIC
+bad_magic_msg: .ascii "bad RDAR magic\r\n\0"
+not_found_msg: .ascii "stage 2 not found\r\n\0"
+disk_err_msg: .ascii "\r\n!!!disk error!!!\r\n\0"
+stage2_path: .ascii BOOT_PATH
+drive_num:  .byte 0
+
+dap:
+    .byte 0x10
+    .byte 0x00
+dap_blkcnt:
+    .word 0
+dap_destptr:
+    .word 0x7C00
+dap_destseg:
+    .word 0x0000
+dap_lba_low:
+    .long 0
+dap_lba_high:
+    .long 0
+
+    .org 510
+    .byte 0x55
+    .byte 0xAA
diff --git a/boot/amd64/generic/mk/build.mk b/boot/amd64/generic/mk/build.mk
new file mode 100644
index 0000000..3388d41
--- /dev/null
+++ b/boot/amd64/generic/mk/build.mk
@@ -0,0 +1,19 @@
+#
+# Copyright (c) 2026, Apollo Telephone Laboratories.
+# Provided under the BSD-3 clause.
+#
+
+CC = 					\
+	clang
+
+INTERNAL_CFLAGS =		\
+	-Wall				\
+	-pedantic			\
+	-ffreestanding		\
+	-nostdlib			\
+	-nostdinc			\
+	-mno-red-zone		\
+	-mno-sse			\
+	-mno-sse2			\
+	-mno-avx			\
+	-mno-avx2
diff --git a/boot/amd64/generic/stage3/Makefile b/boot/amd64/generic/stage3/Makefile
new file mode 100644
index 0000000..08e159e
--- /dev/null
+++ b/boot/amd64/generic/stage3/Makefile
@@ -0,0 +1,22 @@
+#
+# Copyright (c) 2026, Apollo Telephone Laboratories.
+# Provided under the BSD-3 clause.
+#
+
+include ../mk/build.mk
+
+CFLAGS = $(INTERNAL_CFLAGS) -MMD
+CFILES = $(shell find . -name "*.c")
+OFILES = $(CFILES:.c=.o)
+DFILES = $(CFILES:.c=.d)
+
+.PHONY: all
+all: stage3
+
+.PHONY: stage3
+stage3: $(OFILES)
+	$(CC) $(CFLAGS) -Tlink.ld $(OFILES) -o stage3.bin
+
+-include $(DFILES)
+%.o: %.c
+	$(CC) -c $< $(CFLAGS) -o $@
diff --git a/boot/amd64/generic/stage3/entry.c b/boot/amd64/generic/stage3/entry.c
new file mode 100644
index 0000000..3e4b95b
--- /dev/null
+++ b/boot/amd64/generic/stage3/entry.c
@@ -0,0 +1,7 @@
+void
+main(void)
+{
+    for (;;) {
+        __asm__ __volatile__("cli; hlt");
+    }
+}
diff --git a/boot/amd64/generic/stage3/link.ld b/boot/amd64/generic/stage3/link.ld
new file mode 100644
index 0000000..abbd785
--- /dev/null
+++ b/boot/amd64/generic/stage3/link.ld
@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2026, Apollo Telephone Laboratories.
+ * Provided under the BSD-3 clause.
+ */
+
+OUTPUT_FORMAT(binary)
+
+SECTIONS {
+    . = 0x0000;
+
+    .text : {
+        *(.text)
+    }
+
+    .data : {
+        *(.data)
+    }
+
+    .rodata : {
+        *(.rodata)
+    }
+
+    .bss : {
+        *(.bss)
+    }
+}
diff --git a/build.sh b/build.sh
new file mode 100755
index 0000000..839b138
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,64 @@
+#!/bin/bash
+#
+# Copyright (c) 2026, Apollo Telephone Laboratories.
+# Provided under the BSD-3 clause.
+#
+
+MAKE=make
+
+#
+# Check if a list of deps are installed on the host system
+#
+# $@:  Dep list to check
+#
+check_deps() {
+    for dep in $@
+    do
+        printf "Checking if $dep is installed... "
+        which $dep &>/dev/null
+        if [ $? -ne 0 ]
+        then
+            echo "no"
+            echo "fatal: Please install '$dep'!"
+            exit 1
+        fi
+        echo "yes"
+    done
+}
+
+build_prepare() {
+    check_deps      \
+        rsync       \
+        make        \
+        clang       \
+        rdar
+
+    source dev/build.env
+}
+
+#
+# Build a directory with MAKE
+#
+# $1:  Directory to build
+# $2:  Target name
+#
+build_dir() {
+    pushd $1
+        echo "[*] Building $1..."
+        $MAKE
+    popd
+}
+
+#
+# Begin the actual build process
+#
+build() {
+    mkdir -p out
+
+    build_dir           \
+        boot            \
+        "bootloader"
+}
+
+build_prepare
+build
diff --git a/dev/build.env b/dev/build.env
new file mode 100644
index 0000000..03b60ea
--- /dev/null
+++ b/dev/build.env
@@ -0,0 +1,8 @@
+#
+# Copyright (c) 2026, Apollo Telephone Laboratories.
+# Provided under the BSD-3 clause.
+#
+
+export GLOBAL_PROJECT_ROOT=$PWD
+export CONFIG_TARGET_ARCH=amd64
+export CONFIG_TARGET_BOARD=generic