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Merge branch 'riscv' of g.csail.mit.edu:xv6-dev into riscv

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This commit is contained in:
Robert Morris 2020-08-13 08:05:13 -04:00
parent d32eac366f 315c37c0f1
commit e1a2cd59fa
11 changed files with 26 additions and 23 deletions
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2
Makefile
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@ -79,7 +79,7 @@ $K/kernel: $(OBJS) $K/kernel.ld $U/initcode
$(OBJDUMP) -t $K/kernel | sed '1,/SYMBOL TABLE/d; s/ .* / /; /^$$/d' > $K/kernel.sym
$U/initcode: $U/initcode.S
$(CC) $(CFLAGS) -nostdinc -I. -Ikernel -c $U/initcode.S -o $U/initcode.o
$(CC) $(CFLAGS) -march=rv64g -nostdinc -I. -Ikernel -c $U/initcode.S -o $U/initcode.o
$(LD) $(LDFLAGS) -N -e start -Ttext 0 -o $U/initcode.out $U/initcode.o
$(OBJCOPY) -S -O binary $U/initcode.out $U/initcode
$(OBJDUMP) -S $U/initcode.o > $U/initcode.asm

24
README
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@ -15,24 +15,26 @@ Clements.
We are also grateful for the bug reports and patches contributed by
Silas Boyd-Wickizer, Anton Burtsev, Dan Cross, Cody Cutler, Mike CAT,
Tej Chajed, eyalz800, Nelson Elhage, Saar Ettinger, Alice Ferrazzi,
Nathaniel Filardo, Peter Froehlich, Yakir Goaron,Shivam Handa, Bryan
Henry, Jim Huang, Alexander Kapshuk, Anders Kaseorg, kehao95, Wolfgang
Keller, Eddie Kohler, Austin Liew, Imbar Marinescu, Yandong Mao, Matan
Shabtay, Hitoshi Mitake, Carmi Merimovich, Mark Morrissey, mtasm, Joel
Nider, Greg Price, Ayan Shafqat, Eldar Sehayek, Yongming Shen, Cam
Tenny, tyfkda, Rafael Ubal, Warren Toomey, Stephen Tu, Pablo Ventura,
Xi Wang, Keiichi Watanabe, Nicolas Wolovick, wxdao, Grant Wu, Jindong
Zhang, Icenowy Zheng, and Zou Chang Wei.
Tej Chajed, Asami Doi, eyalz800, , Nelson Elhage, Saar Ettinger, Alice
Ferrazzi, Nathaniel Filardo, Peter Froehlich, Yakir Goaron,Shivam
Handa, Bryan Henry, jaichenhengjie, Jim Huang, Alexander Kapshuk,
Anders Kaseorg, kehao95, Wolfgang Keller, Jonathan Kimmitt, Eddie
Kohler, Austin Liew, Imbar Marinescu, Yandong Mao, Matan Shabtay,
Hitoshi Mitake, Carmi Merimovich, Mark Morrissey, mtasm, Joel Nider,
Greg Price, Ayan Shafqat, Eldar Sehayek, Yongming Shen, Fumiya
Shigemitsu, Takahiro, Cam Tenny, tyfkda, Rafael Ubal, Warren Toomey,
Stephen Tu, Pablo Ventura, Xi Wang, Keiichi Watanabe, Nicolas
Wolovick, wxdao, Grant Wu, Jindong Zhang, Icenowy Zheng, and Zou Chang
Wei.
The code in the files that constitute xv6 is
Copyright 2006-2019 Frans Kaashoek, Robert Morris, and Russ Cox.
Copyright 2006-2020 Frans Kaashoek, Robert Morris, and Russ Cox.
ERROR REPORTS
Please send errors and suggestions to Frans Kaashoek and Robert Morris
(kaashoek,rtm@mit.edu). The main purpose of xv6 is as a teaching
operating system for MIT's 6.828, so we are more interested in
operating system for MIT's 6.S081, so we are more interested in
simplifications and clarifications than new features.
BUILDING AND RUNNING XV6

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2
kernel/entry.S
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@ -1,7 +1,7 @@
# qemu -kernel starts at 0x1000. the instructions
# there seem to be provided by qemu, as if it
# were a ROM. the code at 0x1000 jumps to
# 0x8000000, the _start function here,
# 0x80000000, the _start function here,
# in machine mode. each CPU starts here.
.section .data
.globl stack0

14
kernel/proc.c
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@ -183,13 +183,13 @@ proc_freepagetable(pagetable_t pagetable, uint64 sz)
// a user program that calls exec("/init")
// od -t xC initcode
uchar initcode[] = {
0x17, 0x05, 0x00, 0x00, 0x13, 0x05, 0x05, 0x02,
0x97, 0x05, 0x00, 0x00, 0x93, 0x85, 0x05, 0x02,
0x9d, 0x48, 0x73, 0x00, 0x00, 0x00, 0x89, 0x48,
0x73, 0x00, 0x00, 0x00, 0xef, 0xf0, 0xbf, 0xff,
0x2f, 0x69, 0x6e, 0x69, 0x74, 0x00, 0x00, 0x01,
0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00
0x17, 0x05, 0x00, 0x00, 0x13, 0x05, 0x45, 0x02,
0x97, 0x05, 0x00, 0x00, 0x93, 0x85, 0x35, 0x02,
0x93, 0x08, 0x70, 0x00, 0x73, 0x00, 0x00, 0x00,
0x93, 0x08, 0x20, 0x00, 0x73, 0x00, 0x00, 0x00,
0xef, 0xf0, 0x9f, 0xff, 0x2f, 0x69, 0x6e, 0x69,
0x74, 0x00, 0x00, 0x24, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00
};
// Set up first user process.

2
kernel/ramdisk.c
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@ -1,5 +1,5 @@
//
// ramdisk that uses the disk image loaded by qemu -rdinit fs.img
// ramdisk that uses the disk image loaded by qemu -initrd fs.img
//
#include "types.h"

1
kernel/virtio_disk.c
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@ -264,6 +264,7 @@ virtio_disk_intr()
disk.used_idx = (disk.used_idx + 1) % NUM;
}
*R(VIRTIO_MMIO_INTERRUPT_ACK) = *R(VIRTIO_MMIO_INTERRUPT_STATUS) & 0x3;
release(&disk.vdisk_lock);
}

4
kernel/vm.c
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@ -65,9 +65,9 @@ kvminithart()
// A 64-bit virtual address is split into five fields:
// 39..63 -- must be zero.
// 30..38 -- 9 bits of level-2 index.
// 21..39 -- 9 bits of level-1 index.
// 21..29 -- 9 bits of level-1 index.
// 12..20 -- 9 bits of level-0 index.
// 0..12 -- 12 bits of byte offset within the page.
// 0..11 -- 12 bits of byte offset within the page.
pte_t *
walk(pagetable_t pagetable, uint64 va, int alloc)
{