From 55365e593c27b57c50a7369597bd14f110ba8cb6 Mon Sep 17 00:00:00 2001
From: Michal Idziorek <m.i@gmx.at>
Date: Wed, 22 Oct 2014 21:21:32 +0200
Subject: reading userprogramm from ext2 ramimage!

---
 Makefile             |   9 ++--
 fs/Makefile          |  16 ------
 fs/ext2.c            | 143 ++++++++++++++++++++++++++++++++++++++++++++++++++-
 fs/fs.c              |   2 +
 kernel/kernel.c      |   7 ++-
 kernel/mem.c         |   2 +-
 userspace/Makefile   |  24 +++++++--
 userspace/linker.ld  |   2 +-
 userspace/syscalls.c |   7 ++-
 9 files changed, 178 insertions(+), 34 deletions(-)
 delete mode 100644 fs/Makefile

diff --git a/Makefile b/Makefile
index 7c8cc91..2eb2077 100644
--- a/Makefile
+++ b/Makefile
@@ -102,16 +102,16 @@ FoolOS.img: $(MBR) $(STAGE2) kernel.bin $(FILLUP) FoolData.img
 	cp $(FILLUP) $@
 	dd if=$(MBR) of=$@ bs=512 seek=0 conv=notrunc
 	dd if=$(STAGE2) of=$@ bs=512 seek=1 conv=notrunc
-	dd if=kernel.bin of=$@ bs=512 seek=10 conv=notrunc
+	dd if=kernel.bin of=$@ bs=512 seek=10 conv=notrunc #will end up at 0x18000 in ram
 	dd if=FoolData.img of=$@ bs=512 seek=842 conv=notrunc
 
 binfont.img:  binfont.bin
 	cat $^ > $@
 
-FoolData.img: binfont.bin $(MP_BIN) userspace/userprog
+FoolData.img: binfont.bin $(MP_BIN) userspace/ext2.img
 	dd if=$(MP_BIN) of=$@ bs=512 seek=0 conv=notrunc
 	dd if=binfont.bin of=$@ bs=512 seek=1 conv=notrunc
-	dd if=userspace/userprog of=$@ bs=512 seek=4 conv=notrunc
+	dd if=userspace/ext2.img of=$@ bs=512 seek=4 conv=notrunc #will end up at 0x80800 in ram
 
 ############ vm stuff ############
 
@@ -131,10 +131,9 @@ clean:
 release: all
 	-rm *.bin FoolData.img binfont.img bochs.log $(KERNEL_ENTRY) $(ASMOBJECTS) $(OBJECTS) $(FILLUP) $(MBR) $(MP_BIN) bochs.out ne2k-tx.log ne2k-txdump.txt $(STAGE2)
 
-userspace/userprog:
+userspace/ext2.img:
 	make -C userspace
 
-
 ############ test stuff ############
 stick:  FoolOS.img
 	cat FoolOS.img > $(USB_STICK) && sync
diff --git a/fs/Makefile b/fs/Makefile
deleted file mode 100644
index d339621..0000000
--- a/fs/Makefile
+++ /dev/null
@@ -1,16 +0,0 @@
-run: a.out
-	./a.out < ext2.img
-a.out: ext2.c
-	gcc ext2.c -std=c11
-filesys:
-	dd if=/dev/zero of=ext2.img bs=512 count=10000
-	sudo mkfs.ext2 -O none ext2.img 
-	mkdir mnt
-	sudo mount ext2.img mnt
-	sudo chown miguel mnt
-	mkdir mnt/miguel
-	echo "hello one" > mnt/miguel/test1.txt
-	echo "hello two" > mnt/test2.txt
-	sync
-
-
diff --git a/fs/ext2.c b/fs/ext2.c
index bc83f55..bdfb80b 100644
--- a/fs/ext2.c
+++ b/fs/ext2.c
@@ -1,7 +1,10 @@
 // ext2 minidriver
 // based on osdev wiki article: http://wiki.osdev.org/Ext2
 
+#define FOOLOS_MODULE_NAME "ext2"
+
 #include "lib/int/stdint.h"
+#include "lib/logger/log.h"
 
 typedef struct ext2_superblock_struct
 {
@@ -95,13 +98,149 @@ typedef struct ext2_inode_struct
 }ext2_inode;
 
 
+void ram_read(char *in,char *out,int size, int count)
+{
+    for(int i=0;i<size*count;i++)
+    {
+	out[i]=in[i];
+    }
 
-    /*
-int main()
+}
+
+int ext2_check(uint8_t *ram)
 {
     ext2_superblock super;
     ext2_superblock_ext super_ext;
+    uint8_t *ptr=ram+1024;
+    ram_read(ptr,&super,sizeof(super),1);
+    if(super.ext2_sig!=0xef53)log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"no ext2 signature found, where ram-image expected!");
+    //check version and req features.
+    //
+}
+
+ext2_inode ext2_get_inode(uint8_t *ram,int inode_num)
+{
+
+    // get basic shit from superblock!
+    ext2_superblock super;
+    ext2_blockgroup_desc desc;
+    ext2_inode inode;
+
+    uint8_t *ptr=ram+1024;
+    ram_read(ptr,&super,sizeof(super),1);
+    if(super.ext2_sig!=0xef53)log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"no ext2 signature found, where ram-image expected!");
+
+    int block_group=(inode_num-1)/super.inodes_per_group;
+
+    // get descrtptor for our blockgroup!
+    //TODO: only correct for 1024bytes/block. read more than one!!!
+    int block_size=1024;
+    int descriptor_start_block=2;
+
+    ptr=ram+block_size*descriptor_start_block;
+    ptr+=sizeof(desc)*block_group; // skip to our descriptor;
+
+    ram_read(ptr,&desc,sizeof(desc),1); // read descriptor
+
+    // read our inode;
+    ptr=ram+block_size*desc.addr_inode_table;
+    ptr+=128*((inode_num-1)%super.inodes_per_group);
+
+    ram_read(ptr,&inode,sizeof(inode),1); //get inode 2 (rood-directory)
+
+    return inode;
+
+}
+
+
+int ext2_inode_content(char *ram,int inode_nr,uint8_t *ramdest,int max)
+{
+    ext2_inode inode=ext2_get_inode(ram,inode_nr);
+
+    int pos=0;
+    int block=0;
+    int block_size=1024;
+    int block_counter=0;
+    uint8_t *ptr=ram+block_size*inode.direct_pointer[0]; 
+
+    log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"Loading %d %d bytes",inode.size_high, inode.size_low);
+    while(pos<inode.size_low) // use size high?
+    {
+	ramdest[pos]=*ptr;
 
+	ptr++;
+	block_counter++;
+	pos++;
+	if(block_counter>=block_size)
+	{
+	    block++;
+
+	    if(block>=12)
+	    {
+		int indirect_block=block-12;
+		uint32_t *indirect_ptr=ram+block_size*inode.indirect1;
+	  	ptr=ram+block_size*indirect_ptr[indirect_block]; 
+
+	    }
+	    else
+	    {
+	  	    ptr=ram+block_size*inode.direct_pointer[block]; 
+	    }
+
+	    block_counter=0;
+	}
+
+	
+
+    }
+//  if(block>=12)panic(FOOLOS_MODULE_NAME,"such big files unsupported yet");
+
+
+}
+
+
+
+int ext2_read_root_dir(uint8_t *ram)
+{
+   
+    ext2_inode inode=ext2_get_inode(ram,2);
+
+    char buf[256];
+    int block_size=1024;
+    uint8_t *ptr=ram+block_size*inode.direct_pointer[0]; //use other pointers in future!
+
+    int pos=0;
+    while(pos<inode.size_low) // use size high?
+    {
+
+	ext2_dir dir;
+	ram_read(ptr,&dir,sizeof(dir),1);
+	ptr+=sizeof(dir);
+
+	/*
+	printf("inode: %i\n",dir.inode);
+	printf("total size: %i\n",dir.size);
+	printf("length low/high: %i/%i\n\n",dir.name_length_low,dir.name_length_high);
+	*/
+
+//	int l=fread(buf,sizeof(char),dir.name_length_low,stdin);
+	ram_read(ptr,&buf,sizeof(char),dir.name_length_low); 
+	ptr+=dir.name_length_low;
+	
+	buf[dir.name_length_low]=0;
+	log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"%d %s",dir.inode,buf);
+	ptr+=dir.size-8-dir.name_length_low;
+	pos+=dir.size;
+
+    }
+
+}
+
+/*
+int main()
+{
+    ext2_superblock super;
+    ext2_superblock_ext super_ext;
 
     printf("ext2 fools driver\n");
     printf("reading superblock...\n\n");
diff --git a/fs/fs.c b/fs/fs.c
index 85e04ca..e22c715 100644
--- a/fs/fs.c
+++ b/fs/fs.c
@@ -24,3 +24,5 @@ int fs_readdir(const char *name,fs_dirent *dirs,int max)
 }
 
 
+
+
diff --git a/kernel/kernel.c b/kernel/kernel.c
index 1500919..42a2da2 100644
--- a/kernel/kernel.c
+++ b/kernel/kernel.c
@@ -159,7 +159,6 @@ void kernel_main(uint32_t initial_stack, int mp)
     //smp_start_aps(&procdata,0x80000);	// starts at 0x80000 
 					// but it will be copied over mbr
 	
-
     //
     // Activate Virtual Memory (paging)
     //
@@ -203,8 +202,12 @@ void kernel_main(uint32_t initial_stack, int mp)
     //
     //vesa_init_doublebuff();
     
+    ext2_check(0x80800);
+    ext2_read_root_dir(0x80800);
+    ext2_inode_content(0x80800,15,0x100000,0x100000);
+
     // autorun "user-space" prog
-    asm("push $0x80800");
+    asm("push $0x100000");
     asm("ret");
 
     // Just hang around here, if its reached. 
diff --git a/kernel/mem.c b/kernel/mem.c
index af58877..00b6a90 100644
--- a/kernel/mem.c
+++ b/kernel/mem.c
@@ -225,7 +225,7 @@ void mem_init(uint16_t *memmap,uint16_t entries)
     }
     
     // here is somewhere our kernel stuff ;) // todo!! better.
-    pmmngr_deinit_region(0x0,0xfffff);
+    pmmngr_deinit_region(0x0,0x300000);
 
     // and here is the memory map that we JUST created!
     pmmngr_deinit_region(_mmngr_memory_map,mem_array_size*4);
diff --git a/userspace/Makefile b/userspace/Makefile
index fc5e2dd..11eaa74 100644
--- a/userspace/Makefile
+++ b/userspace/Makefile
@@ -3,12 +3,30 @@
 CC=i686-elf-gcc
 LD=i686-elf-ld
 
-CFLAGS=-I/home/miguel/temp/fool-os-stuff/newlib-2.1.0/newlib/libc/include
+CFLAGS=-I/home/miguel/temp/fool-os-stuff/newlib-2.1.0/newlib/libc/include 
 LDFLAGS=-L/home/miguel/temp/fool-os-stuff/newlib-build-clean/i686-elf/newlib/ \
 	-L/home/miguel/temp/fool-os-stuff/newlib-build-clean/i686-elf/libgloss/libnosys/ \
 	-lnosys
 
-all: foolshell.o crt0.o
+ext2.img: userprog
+	dd if=/dev/zero of=ext2.img bs=512 count=200
+	sudo mkfs.ext2 -O none ext2.img 
+	mkdir mnt
+	sudo mount ext2.img mnt
+	sudo chown miguel mnt
+	mkdir mnt/miguel
+	echo "hello one" > mnt/miguel/test1.txt
+	echo "hello two" > mnt/test2.txt
+	cp userprog mnt/shell
+	sync
+	sudo umount mnt
+	rm mnt -rf
+
+userprog: foolshell.o crt0.o
 	${CC}  -T linker.ld ${LDFLAGS} $< -Wl,--oformat,binary  -o userprog
+
 clean:
-	-rm *.o *.out userprog
+	-rm *.o *.out userprog ext2.img
+
+
+
diff --git a/userspace/linker.ld b/userspace/linker.ld
index bfaae93..1d10d3e 100644
--- a/userspace/linker.ld
+++ b/userspace/linker.ld
@@ -1,4 +1,4 @@
 SECTIONS
 {
-    . = 0x80800;
+    . = 0x100000;
 }
diff --git a/userspace/syscalls.c b/userspace/syscalls.c
index f92541c..b514eab 100644
--- a/userspace/syscalls.c
+++ b/userspace/syscalls.c
@@ -13,9 +13,11 @@ easywrite(char *c);
 void syscalls_init()
 {
     preread=0;
-    alloc=0xff0000;
+    alloc=0x500000;
 }
 
+//
+
 int close(int file) 
 {
 // easywrite("syscall: close\n");
@@ -43,8 +45,6 @@ int lseek(int file, int ptr, int dir)
     return preread;
 }
 
-
-
 int read(int file, char *ptr, int len)
 {
 	int ebx; // will hold return value;
@@ -158,7 +158,6 @@ caddr_t sbrk(int incr)
             return (caddr_t) prev_heap_end;
 	    */
 }
-
 //
 
 // helpers
-- 
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