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Calculate ISAPnP checksum while parsing the end tag, allowing for ROMs not ending at the end tag checksum

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RichardG867
2021-03-21 16:59:15 -03:00
parent ba8cec5e23
commit 99405a41b2
1 changed files with 9 additions and 11 deletions
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20
src/device/isapnp.c
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@@ -618,14 +618,6 @@ isapnp_add_card(uint8_t *rom, uint16_t rom_size,
card->rom = rom;
card->rom_size = rom_size;
/* Populate descriptor checksum in ROM. */
uint16_t checksum_offset = card->rom_size - 1;
card->rom[checksum_offset] = 0x00;
for (uint16_t i = 9; i < checksum_offset; i++)
card->rom[checksum_offset] += card->rom[i];
card->rom[checksum_offset] = -card->rom[checksum_offset];
card->priv = priv;
card->config_changed = config_changed;
card->csn_changed = csn_changed;
@@ -647,7 +639,7 @@ isapnp_add_card(uint8_t *rom, uint16_t rom_size,
uint16_t vendor = (card->rom[0] << 8) | card->rom[1];
isapnp_log("ISAPnP: Parsing ROM resources for card %c%c%c%02X%02X (serial %08X)\n", '@' + ((vendor >> 10) & 0x1f), '@' + ((vendor >> 5) & 0x1f), '@' + (vendor & 0x1f), card->rom[2], card->rom[3], (card->rom[7] << 24) | (card->rom[6] << 16) | (card->rom[5] << 8) | card->rom[4]);
#endif
uint16_t i = 9;
uint16_t i = 9, j;
uint8_t ldn = 0, res, in_df = 0;
uint8_t mem_range = 0, mem_range_32 = 0, mem_range_df = 0, mem_range_32_df = 0;
uint32_t len;
@@ -768,11 +760,17 @@ isapnp_add_card(uint8_t *rom, uint16_t rom_size,
in_df = 0;
break;
#ifdef ENABLE_ISAPNP_LOG
case 0x0f: /* end tag */
isapnp_log("ISAPnP: End card resources\n");
/* Calculate checksum. */
res = 0x00;
for (j = 9; j <= i; j++)
res += card->rom[j];
card->rom[i + 1] = -res;
isapnp_log("ISAPnP: End card resources (checksum %02X)\n", card->rom[i + 1]);
break;
#ifdef ENABLE_ISAPNP_LOG
default:
isapnp_log("ISAPnP: >%s%s Small resource %02X (length %d)\n", ldn ? ">" : "", in_df ? ">" : "", res, card->rom[i] & 0x07);
break;