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drm/shared/via_verifier.c

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/*
* Copyright 2004 The Unichrome Project. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sub license,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* THE UNICHROME PROJECT, AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Author: Thomas Hellström 2004.
* This code was written using docs obtained under NDA from VIA Inc.
*
* Don't run this code directly on an AGP buffer. Due to cache problems it will
* be very slow.
*/
#include "via.h"
#include "via_3d_reg.h"
#include "drmP.h"
#include "drm.h"
#include "via_drm.h"
#include "via_verifier.h"
#include "via_drv.h"
typedef enum{
state_command,
state_header2,
state_header1,
state_vheader5,
state_vheader6,
state_error
} verifier_state_t;
typedef enum{
no_check = 0,
check_for_header2,
check_for_header1,
check_for_header2_err,
check_for_header1_err,
check_for_fire,
check_z_buffer_addr0,
check_z_buffer_addr1,
check_z_buffer_addr_mode,
check_destination_addr0,
check_destination_addr1,
check_destination_addr_mode,
check_for_dummy,
check_for_dd,
check_texture_addr0,
check_texture_addr1,
check_texture_addr2,
check_texture_addr3,
check_texture_addr4,
check_texture_addr5,
check_texture_addr6,
check_texture_addr7,
check_texture_addr8,
check_texture_addr_mode,
check_for_vertex_count,
check_number_texunits,
forbidden_command
}hazard_t;
/*
* Associates each hazard above with a possible multi-command
* sequence. For example an address that is split over multiple
* commands and that needs to be checked at the first command
* that does not include any part of the address.
*/
static drm_via_sequence_t seqs[] = {
no_sequence,
no_sequence,
no_sequence,
no_sequence,
no_sequence,
no_sequence,
z_address,
z_address,
z_address,
dest_address,
dest_address,
dest_address,
no_sequence,
no_sequence,
tex_address,
tex_address,
tex_address,
tex_address,
tex_address,
tex_address,
tex_address,
tex_address,
tex_address,
tex_address,
no_sequence
};
typedef struct{
unsigned int code;
hazard_t hz;
} hz_init_t;
static hz_init_t init_table1[] = {
{0xf2, check_for_header2_err},
{0xf0, check_for_header1_err},
{0xee, check_for_fire},
{0xcc, check_for_dummy},
{0xdd, check_for_dd},
{0x00, no_check},
{0x10, check_z_buffer_addr0},
{0x11, check_z_buffer_addr1},
{0x12, check_z_buffer_addr_mode},
{0x13, no_check},
{0x14, no_check},
{0x15, no_check},
{0x23, no_check},
{0x24, no_check},
{0x33, no_check},
{0x34, no_check},
{0x35, no_check},
{0x36, no_check},
{0x37, no_check},
{0x38, no_check},
{0x39, no_check},
{0x3A, no_check},
{0x3B, no_check},
{0x3C, no_check},
{0x3D, no_check},
{0x3E, no_check},
{0x40, check_destination_addr0},
{0x41, check_destination_addr1},
{0x42, check_destination_addr_mode},
{0x43, no_check},
{0x44, no_check},
{0x50, no_check},
{0x51, no_check},
{0x52, no_check},
{0x53, no_check},
{0x54, no_check},
{0x55, no_check},
{0x56, no_check},
{0x57, no_check},
{0x58, no_check},
{0x70, no_check},
{0x71, no_check},
{0x78, no_check},
{0x79, no_check},
{0x7A, no_check},
{0x7B, no_check},
{0x7C, no_check},
{0x7D, check_for_vertex_count}
};
static hz_init_t init_table2[] = {
{0xf2, check_for_header2_err},
{0xf0, check_for_header1_err},
{0xee, check_for_fire},
{0xcc, check_for_dummy},
{0x00, check_texture_addr0},
{0x01, check_texture_addr0},
{0x02, check_texture_addr0},
{0x03, check_texture_addr0},
{0x04, check_texture_addr0},
{0x05, check_texture_addr0},
{0x06, check_texture_addr0},
{0x07, check_texture_addr0},
{0x08, check_texture_addr0},
{0x09, check_texture_addr0},
{0x20, check_texture_addr1},
{0x21, check_texture_addr1},
{0x22, check_texture_addr1},
{0x23, check_texture_addr4},
{0x2B, check_texture_addr3},
{0x2C, check_texture_addr3},
{0x2D, check_texture_addr3},
{0x2E, check_texture_addr3},
{0x2F, check_texture_addr3},
{0x30, check_texture_addr3},
{0x31, check_texture_addr3},
{0x32, check_texture_addr3},
{0x33, check_texture_addr3},
{0x34, check_texture_addr3},
{0x4B, check_texture_addr5},
{0x4C, check_texture_addr6},
{0x51, check_texture_addr7},
{0x52, check_texture_addr8},
{0x77, check_texture_addr2},
{0x78, no_check},
{0x79, no_check},
{0x7A, no_check},
{0x7B, check_texture_addr_mode},
{0x7C, no_check},
{0x7D, no_check},
{0x7E, no_check},
{0x7F, no_check},
{0x80, no_check},
{0x81, no_check},
{0x82, no_check},
{0x83, no_check},
{0x85, no_check},
{0x86, no_check},
{0x87, no_check},
{0x88, no_check},
{0x89, no_check},
{0x8A, no_check},
{0x90, no_check},
{0x91, no_check},
{0x92, no_check},
{0x93, no_check}
};
static hz_init_t init_table3[] = {
{0xf2, check_for_header2_err},
{0xf0, check_for_header1_err},
{0xcc, check_for_dummy},
{0x00, check_number_texunits}
};
static hazard_t table1[256];
static hazard_t table2[256];
static hazard_t table3[256];
static __inline__ int
eat_words(const uint32_t **buf, const uint32_t *buf_end, unsigned num_words)
{
if ((*buf - buf_end) >= num_words) {
*buf += num_words;
return 0;
}
DRM_ERROR("Illegal termination of DMA command buffer\n");
return 1;
}
/*
* Partially stolen from drm_memory.h
*/
static __inline__ drm_map_t *
via_drm_lookup_agp_map (drm_via_state_t *seq, unsigned long offset, unsigned long size,
drm_device_t *dev)
{
struct list_head *list;
drm_map_list_t *r_list;
drm_map_t *map = seq->map_cache;
if (map && map->offset <= offset && (offset + size) <= (map->offset + map->size)) {
return map;
}
list_for_each(list, &dev->maplist->head) {
r_list = (drm_map_list_t *) list;
map = r_list->map;
if (!map)
continue;
if (map->offset <= offset && (offset + size) <= (map->offset + map->size) &&
!(map->flags & _DRM_RESTRICTED) && (map->type == _DRM_AGP)) {
seq->map_cache = map;
return map;
}
}
return NULL;
}
/*
* Require that all AGP texture levels reside in the same AGP map which should
* be mappable by the client. This is not a big restriction.
* FIXME: To actually enforce this security policy strictly, drm_rmmap
* would have to wait for dma quiescent before removing an AGP map.
* The via_drm_lookup_agp_map call in reality seems to take
* very little CPU time.
*/
static __inline__ int
finish_current_sequence(drm_via_state_t *cur_seq)
{
switch(cur_seq->unfinished) {
case z_address:
DRM_DEBUG("Z Buffer start address is 0x%x\n", cur_seq->z_addr);
break;
case dest_address:
DRM_DEBUG("Destination start address is 0x%x\n", cur_seq->d_addr);
break;
case tex_address:
if (cur_seq->agp_texture) {
unsigned start = cur_seq->tex_level_lo[cur_seq->texture];
unsigned end = cur_seq->tex_level_hi[cur_seq->texture];
unsigned long lo=~0, hi=0, tmp;
uint32_t *addr, *pitch, *height, tex;
unsigned i;
if (end > 9) end = 9;
if (start > 9) start = 9;
addr =&(cur_seq->t_addr[tex = cur_seq->texture][start]);
pitch = &(cur_seq->pitch[tex][start]);
height = &(cur_seq->height[tex][start]);
for (i=start; i<= end; ++i) {
tmp = *addr++;
if (tmp < lo) lo = tmp;
tmp += (*height++ << *pitch++);
if (tmp > hi) hi = tmp;
}
if (! via_drm_lookup_agp_map (cur_seq, lo, hi - lo, cur_seq->dev)) {
DRM_ERROR("AGP texture is not in allowed map\n");
return 2;
}
}
break;
default:
break;
}
cur_seq->unfinished = no_sequence;
return 0;
}
static __inline__ int
investigate_hazard( uint32_t cmd, hazard_t hz, drm_via_state_t *cur_seq)
{
register uint32_t tmp, *tmp_addr;
if (cur_seq->unfinished && (cur_seq->unfinished != seqs[hz])) {
int ret;
if ((ret = finish_current_sequence(cur_seq))) return ret;
}
switch(hz) {
case check_for_header2:
if (cmd == HALCYON_HEADER2) return 1;
return 0;
case check_for_header1:
if ((cmd & HALCYON_HEADER1MASK) == HALCYON_HEADER1) return 1;
return 0;
case check_for_header2_err:
if (cmd == HALCYON_HEADER2) return 1;
DRM_ERROR("Illegal DMA HALCYON_HEADER2 command\n");
break;
case check_for_header1_err:
if ((cmd & HALCYON_HEADER1MASK) == HALCYON_HEADER1) return 1;
DRM_ERROR("Illegal DMA HALCYON_HEADER1 command\n");
break;
case check_for_fire:
if ((cmd & HALCYON_FIREMASK) == HALCYON_FIRECMD) return 1;
DRM_ERROR("Illegal DMA HALCYON_FIRECMD command\n");
break;
case check_for_dummy:
if (HC_DUMMY == cmd) return 0;
DRM_ERROR("Illegal DMA HC_DUMMY command\n");
break;
case check_for_dd:
if (0xdddddddd == cmd) return 0;
DRM_ERROR("Illegal DMA 0xdddddddd command\n");
break;
case check_z_buffer_addr0:
cur_seq->unfinished = z_address;
cur_seq->z_addr = (cur_seq->z_addr & 0xFF000000) |
(cmd & 0x00FFFFFF);
return 0;
case check_z_buffer_addr1:
cur_seq->unfinished = z_address;
cur_seq->z_addr = (cur_seq->z_addr & 0x00FFFFFF) |
((cmd & 0xFF) << 24);
return 0;
case check_z_buffer_addr_mode:
cur_seq->unfinished = z_address;
if ((cmd & 0x0000C000) == 0) return 0;
DRM_ERROR("Attempt to place Z buffer in system memory\n");
return 2;
case check_destination_addr0:
cur_seq->unfinished = dest_address;
cur_seq->d_addr = (cur_seq->d_addr & 0xFF000000) |
(cmd & 0x00FFFFFF);
return 0;
case check_destination_addr1:
cur_seq->unfinished = dest_address;
cur_seq->d_addr = (cur_seq->d_addr & 0x00FFFFFF) |
((cmd & 0xFF) << 24);
return 0;
case check_destination_addr_mode:
cur_seq->unfinished = dest_address;
if ((cmd & 0x0000C000) == 0) return 0;
DRM_ERROR("Attempt to place 3D drawing buffer in system memory\n");
return 2;
case check_texture_addr0:
cur_seq->unfinished = tex_address;
tmp = (cmd >> 24);
tmp_addr = &cur_seq->t_addr[cur_seq->texture][tmp];
*tmp_addr = (*tmp_addr & 0xFF000000) | (cmd & 0x00FFFFFF);
return 0;
case check_texture_addr1:
cur_seq->unfinished = tex_address;
tmp = ((cmd >> 24) - 0x20);
tmp += tmp << 1;
tmp_addr = &cur_seq->t_addr[cur_seq->texture][tmp];
*tmp_addr = (*tmp_addr & 0x00FFFFFF) | ((cmd & 0xFF) << 24);
tmp_addr++;
*tmp_addr = (*tmp_addr & 0x00FFFFFF) | ((cmd & 0xFF00) << 16);
tmp_addr++;
*tmp_addr = (*tmp_addr & 0x00FFFFFF) | ((cmd & 0xFF0000) << 8);
return 0;
case check_texture_addr2:
cur_seq->unfinished = tex_address;
cur_seq->tex_level_lo[tmp = cur_seq->texture] = cmd & 0x3F;
cur_seq->tex_level_hi[tmp] = (cmd & 0xFC0) >> 6;
return 0;
case check_texture_addr3:
cur_seq->unfinished = tex_address;
tmp = ((cmd >> 24) - 0x2B);
cur_seq->pitch[cur_seq->texture][tmp] = (cmd & 0x00F00000) >> 20;
if (!tmp && (cmd & 0x000FFFFF)) {
DRM_ERROR("Unimplemented texture level 0 pitch mode.\n");
return 2;
}
return 0;
case check_texture_addr4:
cur_seq->unfinished = tex_address;
tmp_addr = &cur_seq->t_addr[cur_seq->texture][9];
*tmp_addr = (*tmp_addr & 0x00FFFFFF) | ((cmd & 0xFF) << 24);
return 0;
case check_texture_addr5:
case check_texture_addr6:
cur_seq->unfinished = tex_address;
/*
* Texture width. We don't care since we have the pitch.
*/
return 0;
case check_texture_addr7:
cur_seq->unfinished = tex_address;
tmp_addr = &(cur_seq->height[cur_seq->texture][0]);
tmp_addr[5] = 1 << ((cmd & 0x00F00000) >> 20);
tmp_addr[4] = 1 << ((cmd & 0x000F0000) >> 16);
tmp_addr[3] = 1 << ((cmd & 0x0000F000) >> 12);
tmp_addr[2] = 1 << ((cmd & 0x00000F00) >> 8);
tmp_addr[1] = 1 << ((cmd & 0x000000F0) >> 4);
tmp_addr[0] = 1 << (cmd & 0x0000000F);
return 0;
case check_texture_addr8:
cur_seq->unfinished = tex_address;
tmp_addr = &(cur_seq->height[cur_seq->texture][0]);
tmp_addr[9] = 1 << ((cmd & 0x0000F000) >> 12);
tmp_addr[8] = 1 << ((cmd & 0x00000F00) >> 8);
tmp_addr[7] = 1 << ((cmd & 0x000000F0) >> 4);
tmp_addr[6] = 1 << (cmd & 0x0000000F);
return 0;
case check_texture_addr_mode:
cur_seq->unfinished = tex_address;
if ( 2 == (tmp = cmd & 0x00000003)) {
DRM_ERROR("Attempt to fetch texture from system memory.\n");
return 2;
}
cur_seq->agp_texture = (tmp == 3);
cur_seq->tex_palette_size[cur_seq->texture] =
(cmd >> 16) & 0x000000007;
return 0;
case check_for_vertex_count:
cur_seq->vertex_count = cmd & 0x0000FFFF;
return 0;
case check_number_texunits:
cur_seq->multitex = (cmd >> 3) & 1;
return 0;
default:
DRM_ERROR("Illegal DMA data: 0x%x\n", cmd);
return 2;
}
return 2;
}
static __inline__ int
via_check_prim_list(uint32_t const **buffer, const uint32_t *buf_end,
drm_via_state_t *cur_seq)
{
uint32_t a_fire, bcmd , dw_count;
int ret = 0;
int have_fire;
const uint32_t *buf = *buffer;
while(buf < buf_end) {
have_fire = 0;
if ((buf_end - buf) < 2) {
DRM_ERROR("Unexpected termination of primitive list.\n");
ret = 1;
break;
}
if ((*buf & HC_ACMD_MASK) != HC_ACMD_HCmdB) break;
bcmd = *buf++;
if ((*buf & HC_ACMD_MASK) != HC_ACMD_HCmdA) {
DRM_ERROR("Expected Vertex List A command, got 0x%x\n",
*buf);
ret = 1;
break;
}
a_fire = *buf++ | HC_HPLEND_MASK | HC_HPMValidN_MASK | HC_HE3Fire_MASK;
/*
* How many dwords per vertex ?
*/
if (cur_seq->agp && ((bcmd & (0xF << 11)) == 0)) {
DRM_ERROR("Illegal B command vertex data for AGP.\n");
ret = 1;
break;
}
dw_count = 0;
if (bcmd & (1 << 7)) dw_count += (cur_seq->multitex) ? 2:1;
if (bcmd & (1 << 8)) dw_count += (cur_seq->multitex) ? 2:1;
if (bcmd & (1 << 9)) dw_count++;
if (bcmd & (1 << 10)) dw_count++;
if (bcmd & (1 << 11)) dw_count++;
if (bcmd & (1 << 12)) dw_count++;
if (bcmd & (1 << 13)) dw_count++;
if (bcmd & (1 << 14)) dw_count++;
while(buf < buf_end) {
if (*buf == a_fire) {
have_fire = 1;
buf++;
if (buf < buf_end && *buf == a_fire)
buf++;
break;
}
if ((*buf == HALCYON_HEADER2) ||
((*buf & HALCYON_FIREMASK) == HALCYON_FIRECMD)) {
DRM_ERROR("Missing Vertex Fire command, "
"Stray Vertex Fire command or verifier "
"lost sync.\n");
ret = 1;
break;
}
if ((ret = eat_words(&buf, buf_end, dw_count)))
break;
}
if (buf >= buf_end && !have_fire) {
DRM_ERROR("Missing Vertex Fire command or verifier "
"lost sync.\n");
ret = 1;
break;
}
if (cur_seq->agp && ((buf - cur_seq->buf_start) & 0x01)) {
DRM_ERROR("AGP Primitive list end misaligned.\n");
ret = 1;
break;
}
}
*buffer = buf;
return ret;
}
static __inline__ verifier_state_t
via_check_header2( uint32_t const **buffer, const uint32_t *buf_end,
drm_via_state_t *hc_state)
{
uint32_t cmd;
int hz_mode;
hazard_t hz;
const uint32_t *buf = *buffer;
const hazard_t *hz_table;
if ((buf_end - buf) < 2) {
DRM_ERROR("Illegal termination of DMA HALCYON_HEADER2 sequence.\n");
return state_error;
}
buf++;
cmd = (*buf++ & 0xFFFF0000) >> 16;
switch(cmd) {
case HC_ParaType_CmdVdata:
if (via_check_prim_list(&buf, buf_end, hc_state ))
return state_error;
*buffer = buf;
return state_command;
case HC_ParaType_NotTex:
hz_table = table1;
break;
case HC_ParaType_Tex:
hc_state->texture = 0;
hz_table = table2;
break;
case (HC_ParaType_Tex | (HC_SubType_Tex1 << 8)):
hc_state->texture = 1;
hz_table = table2;
break;
case (HC_ParaType_Tex | (HC_SubType_TexGeneral << 8)):
hz_table = table3;
break;
case HC_ParaType_Auto:
if (eat_words(&buf, buf_end, 2))
return state_error;
*buffer = buf;
return state_command;
case (HC_ParaType_Palette | (HC_SubType_Stipple << 8)):
if (eat_words(&buf, buf_end, 32))
return state_error;
*buffer = buf;
return state_command;
case (HC_ParaType_Palette | (HC_SubType_TexPalette0 << 8)):
case (HC_ParaType_Palette | (HC_SubType_TexPalette1 << 8)):
DRM_ERROR("Texture palettes are rejected because of "
"lack of info how to determine their size.\n");
return state_error;
case (HC_ParaType_Palette | (HC_SubType_FogTable << 8)):
DRM_ERROR("Fog factor palettes are rejected because of "
"lack of info how to determine their size.\n");
return state_error;
default:
/*
* There are some unimplemented HC_ParaTypes here, that
* need to be implemented if the Mesa driver is extended.
*/
DRM_ERROR("Invalid or unimplemented HALCYON_HEADER2 "
"DMA subcommand: 0x%x. Previous dword: 0x%x\n",
cmd, *(buf -2));
*buffer = buf;
return state_error;
}
while(buf < buf_end) {
cmd = *buf++;
if ((hz = hz_table[cmd >> 24])) {
if ((hz_mode = investigate_hazard(cmd, hz, hc_state))) {
if (hz_mode == 1) {
buf--;
break;
}
return state_error;
}
} else if (hc_state->unfinished &&
finish_current_sequence(hc_state)) {
return state_error;
}
}
if (hc_state->unfinished && finish_current_sequence(hc_state)) {
return state_error;
}
*buffer = buf;
return state_command;
}
static __inline__ int
verify_mmio_address( uint32_t address)
{
if ((address > 0x3FF) && (address < 0xC00 )) {
DRM_ERROR("Invalid HALCYON_HEADER1 command. "
"Attempt to access 3D- or command burst area.\n");
return 1;
} else if (address > 0xCFF ) {
DRM_ERROR("Invalid HALCYON_HEADER1 command. "
"Attempt to access VGA registers.\n");
return 1;
}
return 0;
}
static __inline__ int
verify_video_tail( uint32_t const **buffer, const uint32_t *buf_end, uint32_t dwords)
{
const uint32_t *buf = *buffer;
if (buf_end - buf < dwords) {
DRM_ERROR("Illegal termination of video command.\n");
return 1;
}
while (dwords--) {
if (*buf++) {
DRM_ERROR("Illegal video command tail.\n");
return 1;
}
}
*buffer = buf;
return 0;
}
static __inline__ verifier_state_t
via_check_header1( uint32_t const **buffer, const uint32_t *buf_end )
{
uint32_t cmd;
const uint32_t *buf = *buffer;
verifier_state_t ret = state_command;
while (buf < buf_end) {
cmd = *buf;
if ((cmd > ((0x3FF >> 2) | HALCYON_HEADER1)) &&
(cmd < ((0xC00 >> 2) | HALCYON_HEADER1))) {
if ((cmd & HALCYON_HEADER1MASK) != HALCYON_HEADER1)
break;
DRM_ERROR("Invalid HALCYON_HEADER1 command. "
"Attempt to access 3D- or command burst area.\n");
ret = state_error;
break;
} else if (cmd > ((0xCFF >> 2) | HALCYON_HEADER1)) {
if ((cmd & HALCYON_HEADER1MASK) != HALCYON_HEADER1)
break;
DRM_ERROR("Invalid HALCYON_HEADER1 command. "
"Attempt to access VGA registers.\n");
ret = state_error;
break;
} else {
buf += 2;
}
}
*buffer = buf;
return ret;
}
static __inline__ verifier_state_t
via_check_vheader5( uint32_t const **buffer, const uint32_t *buf_end )
{
uint32_t data;
const uint32_t *buf = *buffer;
if (buf_end - buf < 4) {
DRM_ERROR("Illegal termination of video header5 command\n");
return state_error;
}
data = *buf++ & ~VIA_VIDEOMASK;
if (verify_mmio_address(data))
return state_error;
data = *buf++;
if (*buf++ != 0x00F50000) {
DRM_ERROR("Illegal header5 header data\n");
return state_error;
}
if (*buf++ != 0x00000000) {
DRM_ERROR("Illegal header5 header data\n");
return state_error;
}
if (eat_words(&buf, buf_end, data))
return state_error;
if (verify_video_tail(&buf, buf_end, 4 - (data & 3)))
return state_error;
*buffer = buf;
return state_command;
}
static __inline__ verifier_state_t
via_check_vheader6( uint32_t const **buffer, const uint32_t *buf_end )
{
uint32_t data;
const uint32_t *buf = *buffer;
uint32_t i;
DRM_ERROR("H6\n");
if (buf_end - buf < 4) {
DRM_ERROR("Illegal termination of video header6 command\n");
return state_error;
}
data = *buf++;
if (*buf++ != 0x00F60000) {
DRM_ERROR("Illegal header6 header data\n");
return state_error;
}
if (*buf++ != 0x00000000) {
DRM_ERROR("Illegal header6 header data\n");
return state_error;
}
if ((buf_end - buf) < (data << 1)) {
DRM_ERROR("Illegal termination of video header6 command\n");
}
for (i=0; i<data; ++i) {
if (verify_mmio_address(*buf++))
return state_error;
buf++;
}
if (verify_video_tail(&buf, buf_end, 4 - ((data << 1) & 3)))
return state_error;
*buffer = buf;
return state_command;
}
int
via_verify_command_stream(const uint32_t * buf, unsigned int size, drm_device_t *dev,
int agp)
{
drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
drm_via_state_t *hc_state = &dev_priv->hc_state;
drm_via_state_t saved_state = *hc_state;
uint32_t cmd;
const uint32_t *buf_end = buf + ( size >> 2 );
verifier_state_t state = state_command;
hc_state->dev = dev;
hc_state->unfinished = no_sequence;
hc_state->map_cache = NULL;
hc_state->agp = agp;
hc_state->buf_start = buf;
while (buf < buf_end) {
switch (state) {
case state_header2:
state = via_check_header2( &buf, buf_end, hc_state );
break;
case state_header1:
state = via_check_header1( &buf, buf_end );
break;
case state_vheader5:
state = via_check_vheader5( &buf, buf_end );
break;
case state_vheader6:
state = via_check_vheader6( &buf, buf_end );
break;
case state_command:
if (HALCYON_HEADER2 == (cmd = *buf))
state = state_header2;
else if ((cmd & HALCYON_HEADER1MASK) == HALCYON_HEADER1)
state = state_header1;
else if ((cmd & VIA_VIDEOMASK) == VIA_VIDEO_HEADER5)
state = state_vheader5;
else if ((cmd & VIA_VIDEOMASK) == VIA_VIDEO_HEADER6)
state = state_vheader6;
else {
DRM_ERROR("Invalid / Unimplemented DMA HEADER command. 0x%x\n",
cmd);
state = state_error;
}
break;
case state_error:
default:
*hc_state = saved_state;
return DRM_ERR(EINVAL);
}
}
if (state == state_error) {
*hc_state = saved_state;
return DRM_ERR(EINVAL);
}
return 0;
}
static void
setup_hazard_table(hz_init_t init_table[], hazard_t table[], int size)
{
int i;
for(i=0; i<256; ++i) {
table[i] = forbidden_command;
}
for(i=0; i<size; ++i) {
table[init_table[i].code] = init_table[i].hz;
}
}
void
via_init_command_verifier( void )
{
setup_hazard_table(init_table1, table1, sizeof(init_table1) / sizeof(hz_init_t));
setup_hazard_table(init_table2, table2, sizeof(init_table2) / sizeof(hz_init_t));
setup_hazard_table(init_table3, table3, sizeof(init_table3) / sizeof(hz_init_t));
}
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