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| 1 | /* | |||
| 2 | * The USB Monitor, inspired by Dave Harding's USBMon. | |||
| 3 | * | |||
| 4 | * mon_dma.c: Library which snoops on DMA areas. | |||
| 5 | * | |||
| 6 | * Copyright (C) 2005 Pete Zaitcev (zaitcev@redhat.com) | |||
| 7 | */ | |||
| 8 | #include <linux/kernel.h> | |||
| 9 | #include <linux/list.h> | |||
| 10 | #include <linux/highmem.h> | |||
| 11 | #include <asm/page.h> | |||
| 12 | ||||
| 13 | #include <linux/usb.h> /* Only needed for declarations in usb_mon.h */ | |||
| 14 | #include "usb_mon.h" | |||
| 15 | ||||
| 16 | #ifdef __i386__ /* CONFIG_ARCH_I386 does not exit */ | |||
| 17 | #define MON_HAS_UNMAP 1 | |||
| 18 | ||||
| 19 | #define phys_to_page(phys) pfn_to_page((phys) >> PAGE_SHIFT) | |||
| 20 | ||||
| 21 | char mon_dmapeek(unsigned char *dst, dma_addr_t dma_addr, int len) | |||
| 22 | { | |||
| 23 | struct page *pg; | |||
| 24 | unsigned long flags; | |||
| 25 | unsigned char *map; | |||
| 26 | unsigned char *ptr; | |||
| 27 | ||||
| 28 | /* | |||
| 29 | * On i386, a DMA handle is the "physical" address of a page. | |||
| 30 | * In other words, the bus address is equal to physical address. | |||
| 31 | * There is no IOMMU. | |||
| 32 | */ | |||
| 33 | pg = phys_to_page(dma_addr); | |||
| 34 | ||||
| 35 | /* | |||
| 36 | * We are called from hardware IRQs in case of callbacks. | |||
| 37 | * But we can be called from softirq or process context in case | |||
| 38 | * of submissions. In such case, we need to protect KM_IRQ0. | |||
| 39 | */ | |||
| 40 | local_irq_save(flags); | |||
| 41 | map = kmap_atomic(pg, KM_IRQ0); | |||
| 42 | ptr = map + (dma_addr & (PAGE_SIZE-1)); | |||
| 43 | memcpy(dst, ptr, len); | |||
| 44 | kunmap_atomic(map, KM_IRQ0); | |||
| 45 | local_irq_restore(flags); | |||
| 46 | return 0; | |||
| 47 | } | |||
| 48 | #endif /* __i386__ */ | |||
| 49 | ||||
| 50 | #ifndef MON_HAS_UNMAP | |||
| 0 | 0 | - | 51 | char mon_dmapeek(unsigned char *dst, dma_addr_t dma_addr, int len) |
| 52 | { | |||
| 0 | - | 53 | return 'D'; | |
| 54 | } | |||
| 55 | #endif | |||
| ***TER 0% (0/2) of SOURCE FILE mon_dma.c | ||||