/* * intercept.c: Handle performance critical I/O packets in hypervisor space * * Copyright (c) 2004, Intel Corporation. * Copyright (c) 2008, Citrix Systems, Inc. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along with * this program; if not, write to the Free Software Foundation, Inc., 59 Temple * Place - Suite 330, Boston, MA 02111-1307 USA. */ #include #include #include #include #include #include #include #include #include #include #include #include #include static const struct hvm_mmio_handler *const hvm_mmio_handlers[HVM_MMIO_HANDLER_NR] = { &hpet_mmio_handler, &vlapic_mmio_handler, &vioapic_mmio_handler, &msixtbl_mmio_handler, &iommu_mmio_handler }; static int hvm_mmio_access(struct vcpu *v, ioreq_t *p, hvm_mmio_read_t read_handler, hvm_mmio_write_t write_handler) { unsigned long data; int rc = X86EMUL_OKAY, i, sign = p->df ? -1 : 1; if ( !p->data_is_ptr ) { if ( p->dir == IOREQ_READ ) { rc = read_handler(v, p->addr, p->size, &data); p->data = data; } else /* p->dir == IOREQ_WRITE */ rc = write_handler(v, p->addr, p->size, p->data); return rc; } if ( p->dir == IOREQ_READ ) { for ( i = 0; i < p->count; i++ ) { int ret; rc = read_handler(v, p->addr + (sign * i * p->size), p->size, &data); if ( rc != X86EMUL_OKAY ) break; ret = hvm_copy_to_guest_phys(p->data + (sign * i * p->size), &data, p->size); if ( (ret == HVMCOPY_gfn_paged_out) || (ret == HVMCOPY_gfn_shared) ) { rc = X86EMUL_RETRY; break; } } } else { for ( i = 0; i < p->count; i++ ) { int ret; ret = hvm_copy_from_guest_phys(&data, p->data + (sign * i * p->size), p->size); if ( (ret == HVMCOPY_gfn_paged_out) || (ret == HVMCOPY_gfn_shared) ) { rc = X86EMUL_RETRY; break; } rc = write_handler(v, p->addr + (sign * i * p->size), p->size, data); if ( rc != X86EMUL_OKAY ) break; } } if ( i != 0 ) { p->count = i; rc = X86EMUL_OKAY; } return rc; } int hvm_mmio_intercept(ioreq_t *p) { struct vcpu *v = current; int i; for ( i = 0; i < HVM_MMIO_HANDLER_NR; i++ ) if ( hvm_mmio_handlers[i]->check_handler(v, p->addr) ) return hvm_mmio_access( v, p, hvm_mmio_handlers[i]->read_handler, hvm_mmio_handlers[i]->write_handler); return X86EMUL_UNHANDLEABLE; } static int process_portio_intercept(portio_action_t action, ioreq_t *p) { int rc = X86EMUL_OKAY, i, sign = p->df ? -1 : 1; uint32_t data; if ( !p->data_is_ptr ) { if ( p->dir == IOREQ_READ ) { rc = action(IOREQ_READ, p->addr, p->size, &data); p->data = data; } else { data = p->data; rc = action(IOREQ_WRITE, p->addr, p->size, &data); } return rc; } if ( p->dir == IOREQ_READ ) { for ( i = 0; i < p->count; i++ ) { rc = action(IOREQ_READ, p->addr, p->size, &data); if ( rc != X86EMUL_OKAY ) break; (void)hvm_copy_to_guest_phys(p->data + sign*i*p->size, &data, p->size); } } else /* p->dir == IOREQ_WRITE */ { for ( i = 0; i < p->count; i++ ) { data = 0; (void)hvm_copy_from_guest_phys(&data, p->data + sign*i*p->size, p->size); rc = action(IOREQ_WRITE, p->addr, p->size, &data); if ( rc != X86EMUL_OKAY ) break; } } if ( i != 0 ) { p->count = i; rc = X86EMUL_OKAY; } return rc; } /* * Check if the request is handled inside xen * return value: 0 --not handled; 1 --handled */ int hvm_io_intercept(ioreq_t *p, int type) { struct vcpu *v = current; struct hvm_io_handler *handler = v->domain->arch.hvm_domain.io_handler; int i; unsigned long addr, size; if ( type == HVM_PORTIO ) { int rc = dpci_ioport_intercept(p); if ( (rc == X86EMUL_OKAY) || (rc == X86EMUL_RETRY) ) return rc; } for ( i = 0; i < handler->num_slot; i++ ) { if ( type != handler->hdl_list[i].type ) continue; addr = handler->hdl_list[i].addr; size = handler->hdl_list[i].size; if ( (p->addr >= addr) && ((p->addr + p->size) <= (addr + size)) ) { if ( type == HVM_PORTIO ) return process_portio_intercept( handler->hdl_list[i].action.portio, p); return handler->hdl_list[i].action.mmio(p); } } return X86EMUL_UNHANDLEABLE; } void register_io_handler( struct domain *d, unsigned long addr, unsigned long size, void *action, int type) { struct hvm_io_handler *handler = d->arch.hvm_domain.io_handler; int num = handler->num_slot; BUG_ON(num >= MAX_IO_HANDLER); handler->hdl_list[num].addr = addr; handler->hdl_list
/*
 * patch-cmdline.c - patch the kernel command line on rb532
 *
 * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * $Id:$
 */

#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <string.h>

#define SEARCH_SPACE	(16 * 1024)
#define CMDLINE_MAX		512

int main(int argc, char **argv)
{
	int fd, found = 0, len, ret = -1;
	char *ptr, *p;

	if (argc != 3) {
		fprintf(stderr, "Usage: %s <file> <cmdline>\n", argv[0]);
		goto err1;
	}
	len = strlen(argv[2]);
	if (len + 9 > CMDLINE_MAX) {
		fprintf(stderr, "Command line string too long\n");
		goto err1;
	}
	
	if (((fd = open(argv[1], O_RDWR)) < 0) ||
		(ptr = (char *) mmap(0, SEARCH_SPACE + CMDLINE_MAX, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0)) == (void *) (-1)) {
		fprintf(stderr, "Could not open kernel image");
		goto err2;
	}
	
	for (p = ptr; p < (ptr + SEARCH_SPACE); p += 4) {
		if (memcmp(p, "CMDLINE:", 8) == 0) {
			found = 1;
			p += 8;
			break;
		}
	}
	if (!found) {
		fprintf(stderr, "Command line marker not found!\n");
		goto err3;
	}

	memset(p, 0, CMDLINE_MAX - 8);
	strcpy(p, argv[2]);
	msync(p, CMDLINE_MAX, MS_SYNC|MS_INVALIDATE);
	ret = 0;

err3:
	munmap((void *) ptr, len);
err2:
	if (fd > 0)
		close(fd);
err1:
	return ret;
}
generated by cgit v1.2.3 (git 2.25.1) at 2026-02-18 19:37:31 +0000