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cab2e8bdd3
Finished adding untested shm syscalls. Finished adding untested l4 send/recv helpers Everything compiles. Now going to fix lots of bugs ;-)
117 lines
2.8 KiB
C
117 lines
2.8 KiB
C
/*
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* A basic ramdisk implementation.
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*
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* Copyright (C) 2007, 2008 Bahadir Balban
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*
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* The ramdisk binary is embedded in the data section of the ramdisk device
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* executable. Read/writes simply occur to this area. The disk area could
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* have any filesystem layout e.g. romfs, which is irrelevant for this code.
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*/
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#include <blkdev.h>
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#include <ramdisk.h>
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#include <l4/macros.h>
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#include <l4/config.h>
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#include <l4/types.h>
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#include <string.h>
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#include INC_SUBARCH(mm.h)
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#include INC_GLUE(memory.h)
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/* Ramdisk section markers for ramdisk inside this executable image */
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extern char _start_ramdisk0[];
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extern char _end_ramdisk0[];
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extern char _start_ramdisk1[];
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extern char _end_ramdisk1[];
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struct ramdisk_data {
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u64 base;
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u64 end;
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};
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struct ramdisk_data rddata[2];
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__attribute__((section(".data.sfs"))) char sfsdisk[SZ_16MB];
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int ramdisk_init(struct block_device *ramdisk)
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{
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struct ramdisk_data *rddata = ramdisk->private;
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if (!strcmp("ramdisk0", ramdisk->name)) {
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rddata->base = (u64)(unsigned long)_start_ramdisk0;
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rddata->end = (u64)(unsigned long)_end_ramdisk0;
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ramdisk->size = (u64)((unsigned long)_end_ramdisk0 -
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(unsigned long)_start_ramdisk0);
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} else if (!strcmp("ramdisk1", ramdisk->name)) {
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rddata->base = (u64)(unsigned long)_start_ramdisk1;
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rddata->end = (u64)(unsigned long)_end_ramdisk1;
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ramdisk->size = (u64)((unsigned long)_end_ramdisk1 -
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(unsigned long)_start_ramdisk1);
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} else
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return -1;
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return 0;
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}
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int ramdisk_open(struct block_device *ramdisk)
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{
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return 0;
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}
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int ramdisk_read(struct block_device *b, unsigned long offset, int size, void *buf)
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{
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struct ramdisk_data *data = b->private;
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void *src = (void *)(unsigned long)(data->base + offset);
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memcpy(buf, src, size);
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return 0;
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}
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int ramdisk_write(struct block_device *b, unsigned long offset,
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int size, void *buf)
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{
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struct ramdisk_data *data = b->private;
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void *dst = (void *)(unsigned long)(data->base + offset);
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memcpy(dst, buf, size);
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return 0;
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}
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int ramdisk_readpage(struct block_device *b, unsigned long pfn, void *buf)
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{
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ramdisk_read(b, __pfn_to_addr(pfn), PAGE_SIZE, buf);
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return 0;
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}
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int ramdisk_writepage(struct block_device *b, unsigned long pfn, void *buf)
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{
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ramdisk_write(b, __pfn_to_addr(pfn), PAGE_SIZE, buf);
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return 0;
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}
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struct block_device ramdisk[2] = {
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[0] = {
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.name = "ramdisk0",
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.private = &rddata[0],
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.ops = {
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.init = ramdisk_init,
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.open = ramdisk_open,
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.read = ramdisk_read,
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.write = ramdisk_write,
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.read_page = ramdisk_readpage,
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.write_page = ramdisk_writepage,
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},
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},
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[1] = {
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.name = "ramdisk1",
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.private = &rddata[1],
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.ops = {
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.init = ramdisk_init,
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.open = ramdisk_open,
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.read = ramdisk_read,
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.write = ramdisk_write,
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.read_page = ramdisk_readpage,
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.write_page = ramdisk_writepage,
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},
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}
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};
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