45 lines
1.3 KiB
Plaintext
45 lines
1.3 KiB
Plaintext
OpenBSD's /dev/pci only permits aligned 32 bit writes.
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Emulate smaller writes by doing read/modify/write.
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http://marc.info/?l=openbsd-ports&m=127780030728045&w=2
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--- pciutils/lib/obsd-device.c.orig Sat May 21 22:41:31 2016
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+++ pciutils/lib/obsd-device.c Sat May 21 22:41:34 2016
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@@ -109,19 +109,31 @@ obsd_write(struct pci_dev *d, int pos, byte *buf, int
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pi.pi_sel.pc_dev = d->dev;
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pi.pi_sel.pc_func = d->func;
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- pi.pi_reg = pos;
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- pi.pi_width = len;
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+ pi.pi_reg = pos - (pos % 4);
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+ pi.pi_width = 4;
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+ pi.pi_data = 0xffffffff;
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+ /* Questionable read-modify-write cycle for non-32-bit writes */
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+ if (len != 4)
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+ if (ioctl(d->access->fd, PCIOCREAD, &pi) < 0)
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+ {
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+ /* Abort on any error because the write will contain garbage */
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+ d->access->error("obsd_read: ioctl(PCIOCREAD) failed");
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+ return 0;
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+ }
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+
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switch (len)
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{
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case 1:
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- pi.pi_data = buf[0];
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+ pi.pi_data &= ~(0xff << ((pos % 4) * 8));
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+ pi.pi_data |= buf[0] << ((pos % 4) * 8);
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break;
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case 2:
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- pi.pi_data = ((u16 *) buf)[0];
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+ pi.pi_data &= ~(0xffff << ((pos % 4) * 8));
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+ pi.pi_data |= htole16(((u16 *) buf)[0]) << ((pos % 4) * 8);
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break;
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case 4:
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- pi.pi_data = ((u32 *) buf)[0];
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+ pi.pi_data = htole32(((u32 *) buf)[0]);
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break;
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}
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