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xhci: mark legacy support regs as volatile and preserve reserved bits.

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This commit is contained in:
Martin Whitaker 2022-05-01 11:49:39 +01:00
parent 8284e98761
commit 3aebe091cb
1 changed files with 2 additions and 2 deletions
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4
system/xhci.c
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@ -211,7 +211,7 @@ typedef struct {
uint8_t id_specific[2]; uint8_t id_specific[2];
} xhci_ext_cap_t; } xhci_ext_cap_t;
typedef struct { typedef volatile struct {
uint8_t id; uint8_t id;
uint8_t next_offset; uint8_t next_offset;
uint8_t bios_owns; uint8_t bios_owns;
@ -987,7 +987,7 @@ bool xhci_init(uintptr_t base_addr, usb_hcd_t *hcd)
xhci_legacy_support_t *legacy_support = (xhci_legacy_support_t *)ext_cap_base; xhci_legacy_support_t *legacy_support = (xhci_legacy_support_t *)ext_cap_base;
// Take ownership from the SMM if necessary. // Take ownership from the SMM if necessary.
int timer = 1000; int timer = 1000;
legacy_support->host_owns = 0x1; legacy_support->host_owns |= 0x1;
while (legacy_support->bios_owns & 0x1) { while (legacy_support->bios_owns & 0x1) {
if (timer == 0) return false; if (timer == 0) return false;
usleep(1*MILLISEC); usleep(1*MILLISEC);