353 lines
9.0 KiB
C
353 lines
9.0 KiB
C
/*
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* American Megatrends ROM Driver
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* There wasn't a copyright here, so idk
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*/
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#include <asm/io.h>
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#include <linux/version.h>
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/version.h>
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#define LINUX_PRE_2_6 (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0))
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#define LINUX_POST_2_6 (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
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#if LINUX_PRE_2_6
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# include <linux/wrapper.h>
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#else
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# define mem_map_reserve(p) set_bit (PG_reserved, &((p)->flags))
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# define mem_map_unreserve(p) clear_bit(PG_reserved, &((p)->flags))
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#endif
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#define CMD_ALLOC 0x4160
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#define CMD_FREE 0x4161
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#define CMD_LOCK_KB 0x4162
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#define CMD_UNLOCK_KB 0x4163
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/*
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* ioctl data packet used to communicate instructions to the driver
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*/
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typedef struct _struct_AMIFL_alloc_params {
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long size;
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unsigned long kvirtlen;
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void* kmallocptr;
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void* kvirtadd;
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void* kphysadd;
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} AMIFL_alloc_params;
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static int *kmalloc_area = NULL;
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static int *kmalloc_ptr = NULL;
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static unsigned long kmalloc_len = 0L;
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static int kcount = 0;
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static int major;
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static AMIFL_alloc_params kmalloc_drv[128];
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/*
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* Section: Character Device Implementation
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* ============================================================================
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*/
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#if LINUX_POST_2_6
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static int chardev_open_count = 0;
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#endif
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/**
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* Character Device open action
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*/
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int
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AMI_chrdrv_open(struct inode* inode, struct file* file)
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{
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#if LINUX_PRE_2_6
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MOD_INC_USE_COUNT;
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#else
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if (chardev_open_count > 0)
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{
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return -EBUSY;
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}
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++chardev_open_count;
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try_module_get(THIS_MODULE);
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#endif
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return(0);
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}
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int
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AMI_chrdrv_release(struct inode* inode, struct file* file)
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{
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#if LINUX_PRE_2_6
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MOD_DEC_USE_COUNT;
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#else
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--chardev_open_count;
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module_put(THIS_MODULE);
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#endif
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return(0);
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}
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#if defined(HAVE_UNLOCKED_IOCTL)
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long
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AMI_chrdrv_ioctl(struct file* _unused_file, unsigned int cmd, unsigned long arg)
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#else
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int
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AMI_chrdrv_ioctl(struct inode* _unused_inode, unsigned int cmd, unsigned long arg)
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#endif
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{
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switch(cmd)
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{
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case CMD_ALLOC:
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{
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unsigned long virt_addr;
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AMIFL_alloc_params arg_kernel_space;
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if (kcount >= 128)
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{
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return -EINVAL;
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}
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kmalloc_ptr = NULL;
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if (!arg || kmalloc_ptr)
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{
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return -EINVAL;
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}
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copy_from_user((void*) &arg_kernel_space, (void*) arg, sizeof(AMIFL_alloc_params));
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if (arg_kernel_space.size > 128 * 1024)
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{
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return -EINVAL;
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}
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kmalloc_len = ((arg_kernel_space.size + PAGE_SIZE - 1) & PAGE_MASK);
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kmalloc_ptr = kmalloc((kmalloc_len + 2 * PAGE_SIZE), GFP_DMA | GFP_KERNEL);
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kmalloc_area = (int *)(((unsigned long)kmalloc_ptr + PAGE_SIZE - 1) & PAGE_MASK);
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for (virt_addr = (unsigned long) kmalloc_area;
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virt_addr < (unsigned long) kmalloc_area + kmalloc_len;
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virt_addr += PAGE_SIZE)
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{
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mem_map_reserve(virt_to_page(virt_addr));
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}
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{
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int i;
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for (i = 0; i < (kmalloc_len / sizeof(int)); ++i) {
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kmalloc_area[i] = 0xAFD00000 + i;
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}
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}
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kmalloc_drv[kcount].size = arg_kernel_space.size;
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kmalloc_drv[kcount].kmallocptr = kmalloc_ptr;
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kmalloc_drv[kcount].kvirtlen = kmalloc_len;
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kmalloc_drv[kcount].kvirtadd = kmalloc_area;
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kmalloc_drv[kcount].kphysadd = (void *)((unsigned long)virt_to_phys(kmalloc_area));
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++kcount;
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arg_kernel_space.kvirtadd = kmalloc_area;
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arg_kernel_space.kphysadd = (void *)((unsigned long)virt_to_phys(kmalloc_area));
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copy_to_user((void*) arg, (void*) &arg_kernel_space, sizeof(AMIFL_alloc_params));
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return 0;
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}
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case CMD_FREE:
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{
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unsigned long virt_addr;
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AMIFL_alloc_params arg_kernel_space;
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int isearch = 0;
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copy_from_user((void*) &arg_kernel_space, (void*) arg, sizeof(AMIFL_alloc_params));
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if (kcount > 0) {
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for (isearch=0; isearch<kcount; isearch++) {
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if (kmalloc_drv[isearch].kphysadd == arg_kernel_space.kphysadd) break;
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}
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if (isearch >= kcount) return 0;
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kmalloc_ptr = kmalloc_drv[isearch].kmallocptr;
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kmalloc_area = kmalloc_drv[isearch].kvirtadd;
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kmalloc_len = kmalloc_drv[isearch].kvirtlen;
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} else
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return 0;
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if (kmalloc_ptr) {
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for(virt_addr = (unsigned long) kmalloc_area;
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virt_addr < (unsigned long) kmalloc_area + kmalloc_len;
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virt_addr += PAGE_SIZE)
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{
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mem_map_unreserve(virt_to_page(virt_addr));
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}
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if (kmalloc_ptr) {
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kfree(kmalloc_ptr);
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}
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kmalloc_len = 0L;
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kmalloc_ptr = NULL;
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kmalloc_area = NULL;
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kcount--;
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if (isearch != kcount) {
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kmalloc_drv[isearch].size = kmalloc_drv[kcount].size;
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kmalloc_drv[isearch].kmallocptr = kmalloc_drv[kcount].kmallocptr;
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kmalloc_drv[isearch].kvirtlen = kmalloc_drv[kcount].kvirtlen;
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kmalloc_drv[isearch].kvirtadd = kmalloc_drv[kcount].kvirtadd;
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kmalloc_drv[isearch].kphysadd = kmalloc_drv[kcount].kphysadd;
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}
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kmalloc_drv[kcount].size = 0;
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kmalloc_drv[kcount].kmallocptr = NULL;
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kmalloc_drv[kcount].kvirtlen = 0;
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kmalloc_drv[kcount].kvirtadd = NULL;
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kmalloc_drv[kcount].kphysadd = NULL;
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}
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return 0;
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}
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case CMD_LOCK_KB:
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disable_irq(1);
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return 0;
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case CMD_UNLOCK_KB:
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enable_irq(1);
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return 0;
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}
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return -ENOTTY;
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}
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int
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AMI_chrdrv_mmap(struct file* file, struct vm_area_struct* vma)
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{
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unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
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unsigned long size = vma->vm_end - vma->vm_start;
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if (offset & ~PAGE_MASK) {
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return -ENXIO;
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}
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if (!kmalloc_ptr) {
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return(-ENXIO);
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}
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if (size > kmalloc_len) {
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return(-ENXIO);
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}
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if ((offset+size) > kmalloc_len) {
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return -ENXIO;
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}
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if ((vma->vm_flags & VM_WRITE) && !(vma->vm_flags & VM_SHARED)) {
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return(-EINVAL);
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}
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vma->vm_flags |= VM_LOCKED;
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{
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unsigned long pfn = virt_to_phys((void*)((unsigned long) kmalloc_area));
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#if LINUX_POST_2_6
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int remap_result =
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remap_pfn_range(vma,
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vma->vm_start,
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pfn >> PAGE_SHIFT,
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size,
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PAGE_SHARED);
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#else
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int remap_result =
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remap_page_range(vma,
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vma->vm_start,
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pfn,
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size,
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PAGE_SHARED);
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#endif
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if (remap_result)
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{
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return -ENXIO;
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}
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}
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return(0);
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}
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#if defined(HAVE_UNLOCKED_IOCTL)
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# define $IOCTL_FIELD unlocked_ioctl
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#else
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# define $IOCTL_FIELD ioctl
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#endif
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struct file_operations AMI_chrdrv_fops = {
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owner: THIS_MODULE,
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open: AMI_chrdrv_open,
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release: AMI_chrdrv_release,
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mmap: AMI_chrdrv_mmap,
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$IOCTL_FIELD: AMI_chrdrv_ioctl,
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};
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/*
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* Section: Linux Kernel Module Setup
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* ============================================================================
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*/
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#if LINUX_POST_2_6
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MODULE_AUTHOR ("American Megatrends Inc.");
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MODULE_DESCRIPTION ("AMI Flash Update utility driver");
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MODULE_LICENSE ("Proprietary");
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#endif
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static int /* module_init */
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amifldrv_init_module(void)
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{
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major = register_chrdev(0, "amifldrv", &AMI_chrdrv_fops);
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if (major < 0)
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{
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return -EIO;
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}
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memset(kmalloc_drv, 0, sizeof(AMIFL_alloc_params) * 128);
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return(0);
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}
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static void /* module_exit */
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amifldrv_cleanup_module(void)
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{
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unsigned long virt_addr;
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if (kcount > 0)
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{
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{
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int iloop;
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for (iloop = 0; iloop < kcount; ++iloop)
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{
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kmalloc_ptr = kmalloc_drv[iloop].kmallocptr;
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kmalloc_area = kmalloc_drv[iloop].kvirtadd;
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kmalloc_len = kmalloc_drv[iloop].kvirtlen;
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if (kmalloc_ptr)
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{
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for(virt_addr = (unsigned long)kmalloc_area;
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virt_addr < (unsigned long)kmalloc_area + kmalloc_len;
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virt_addr += PAGE_SIZE)
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{
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mem_map_unreserve(virt_to_page(virt_addr));
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}
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if (kmalloc_ptr)
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{
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kfree(kmalloc_ptr);
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}
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}
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}
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}
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kcount = 0;
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}
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unregister_chrdev(major, "amifldrv");
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return;
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}
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module_init(amifldrv_init_module);
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module_exit(amifldrv_cleanup_module);
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