On 2/7/07, Martyn Welch <[EMAIL PROTECTED]> wrote:
Which leads me to the question: what is the best method to reserve a large (~4MB) coherent buffer for DMA transfers?
May be you should to use alloc_pages with __GFP_DMA flag, and then use page_address to get address of first allocated page.
Is there any way of using alloc_bootmem from a driver (compiled into the kernel) without delving further into kernel code?
yes, i think: -> (~/devel/learn/src/kernels/linux-2.6.19) [EMAIL PROTECTED] find drivers/ -name "*" | xargs grep alloc_bootmem drivers/char/vt.c: vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data)); drivers/char/vt.c: vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size); Binary file drivers/char/vt.o matches Binary file drivers/char/built-in.o matches Binary file drivers/firmware/dmi_scan.o matches Binary file drivers/firmware/built-in.o matches drivers/macintosh/smu.c: smu = alloc_bootmem(sizeof(struct smu_device)); drivers/s390/char/con3215.c: req = (struct raw3215_req *) alloc_bootmem_low(sizeof(struct raw3215_req)); drivers/s390/char/con3215.c: alloc_bootmem_low(sizeof(struct raw3215_info)); drivers/s390/char/con3215.c: raw->buffer = (char *) alloc_bootmem_low(RAW3215_BUFFER_SIZE); drivers/s390/char/con3215.c: raw->inbuf = (char *) alloc_bootmem_low(RAW3215_INBUF_SIZE); drivers/s390/char/con3270.c: condev = (struct con3270 *) alloc_bootmem_low(sizeof(struct con3270)); drivers/s390/char/con3270.c: condev->read = raw3270_request_alloc_bootmem(0); drivers/s390/char/con3270.c: raw3270_request_alloc_bootmem(CON3270_OUTPUT_BUFFER_SIZE); drivers/s390/char/con3270.c: condev->kreset = raw3270_request_alloc_bootmem(1); drivers/s390/char/con3270.c: cbuf = (void *) alloc_bootmem_low_pages(PAGE_SIZE); drivers/s390/char/raw3270.c:raw3270_request_alloc_bootmem(size_t size) drivers/s390/char/raw3270.c: rq = alloc_bootmem_low(sizeof(struct raw3270)); drivers/s390/char/raw3270.c: rq->buffer = alloc_bootmem_low(size); drivers/s390/char/raw3270.c: rp = (struct raw3270 *) alloc_bootmem_low(sizeof(struct raw3270)); drivers/s390/char/raw3270.c: ascebc = (char *) alloc_bootmem(256); drivers/s390/char/raw3270.h:struct raw3270_request *raw3270_request_alloc_bootmem(size_t size); drivers/s390/char/sclp_con.c: page = alloc_bootmem_low_pages(PAGE_SIZE); drivers/s390/char/sclp_vt220.c: page = alloc_bootmem_low_pages(PAGE_SIZE); drivers/serial/cpm_uart/cpm_uart_cpm2.c: mem_addr = alloc_bootmem(memsz); drivers/video/console/vgacon.c: vgacon_scrollback = alloc_bootmem(CONFIG_VGACON_SOFT_SCROLLBACK_SIZE Binary file drivers/video/console/vgacon.o matches Binary file drivers/video/console/built-in.o matches Binary file drivers/video/built-in.o matches Binary file drivers/built-in.o matches
Martyn ________________________________________________________________________ This e-mail has been scanned for all viruses by Star.The service is powered by MessageLabs. ________________________________________________________________________
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