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Code Issues Releases Activity

Various 8259 device model improvements:

Browse Source 
- implement 8259 "polled" mode.
- set 'atpic->sfn' if bit 4 in ICW4 is set during master initialization.
- report error if guest tries to enable the "special mask" mode.

Differential Revision:	https://reviews.freebsd.org/D1328
Reviewed by:		tychon
Reported by:		grehan
Tested by:		grehan
MFC after:		1 week
This commit is contained in:
Neel Natu 2014-12-20 04:57:45 +00:00
parent dc47198f50
commit ac721e53ec
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=275952
1 changed files with 37 additions and 4 deletions
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41
sys/amd64/vmm/io/vatpic.c
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@ -112,6 +112,16 @@ struct vatpic {
static void vatpic_set_pinstate(struct vatpic *vatpic, int pin, bool newstate);
static __inline bool
master_atpic(struct vatpic *vatpic, struct atpic *atpic)
{
if (atpic == &vatpic->atpic[0])
return (true);
else
return (false);
}
static __inline int
vatpic_get_highest_isrpin(struct atpic *atpic)
{
@ -250,6 +260,7 @@ vatpic_icw1(struct vatpic *vatpic, struct atpic *atpic, uint8_t val)
atpic->mask = 0;
atpic->lowprio = 7;
atpic->rd_cmd_reg = 0;
atpic->poll = 0;
if ((val & ICW1_SNGL) != 0) {
VATPIC_CTR0(vatpic, "vatpic cascade mode required");
@ -301,6 +312,15 @@ vatpic_icw4(struct vatpic *vatpic, struct atpic *atpic, uint8_t val)
if ((val & ICW4_AEOI) != 0)
atpic->aeoi = true;
if ((val & ICW4_SFNM) != 0) {
if (master_atpic(vatpic, atpic)) {
atpic->sfn = true;
} else {
VATPIC_CTR1(vatpic, "Ignoring special fully nested "
"mode on slave atpic: %#x", val);
}
}
atpic->icw_num = 0;
atpic->ready = true;
@ -354,11 +374,17 @@ vatpic_ocw3(struct vatpic *vatpic, struct atpic *atpic, uint8_t val)
{
VATPIC_CTR1(vatpic, "atpic ocw3 0x%x", val);
atpic->poll = ((val & OCW3_P) != 0);
if (val & OCW3_ESMM) {
VATPIC_CTR0(vatpic, "atpic special mask mode not implemented");
return (-1);
}
if (val & OCW3_RR) {
/* read register command */
atpic->rd_cmd_reg = val & OCW3_RIS;
/* Polling mode */
atpic->poll = ((val & OCW3_P) != 0);
}
return (0);
@ -578,12 +604,19 @@ static int
vatpic_read(struct vatpic *vatpic, struct atpic *atpic, bool in, int port,
int bytes, uint32_t *eax)
{
int pin;
VATPIC_LOCK(vatpic);
if (atpic->poll) {
VATPIC_CTR0(vatpic, "vatpic polled mode not supported");
VATPIC_UNLOCK(vatpic);
return (-1);
atpic->poll = 0;
pin = vatpic_get_highest_irrpin(atpic);
if (pin >= 0) {
vatpic_pin_accepted(atpic, pin);
*eax = 0x80 | pin;
} else {
*eax = 0;
}
} else {
if (port & ICU_IMR_OFFSET) {
/* read interrrupt mask register */