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Added ipc save/restore for page-fault ipcs.

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The save restore routines save all primary message registers and ipc flags.
This commit is contained in:
Bahadir Balban
2009-05-28 12:52:14 +03:00
parent 391b0ca1d0
commit ba31e1b823
3 changed files with 86 additions and 28 deletions
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47
src/api/ipc.c
View File

@@ -506,29 +506,38 @@ static inline int __sys_ipc(l4id_t to, l4id_t from,
{
int ret;
switch (ipc_type) {
case IPC_SEND:
if (flags & IPC_FLAGS_EXTENDED)
if (ipc_flags_get_type(flags) == IPC_FLAGS_EXTENDED) {
switch (ipc_type) {
case IPC_SEND:
ret = ipc_send_extended(to, flags);
else
ret = ipc_send(to, flags);
break;
case IPC_RECV:
if (flags & IPC_FLAGS_EXTENDED)
break;
case IPC_RECV:
ret = ipc_recv_extended(from, flags);
else
ret = ipc_recv(from, flags);
break;
case IPC_SENDRECV:
if (flags & IPC_FLAGS_EXTENDED)
break;
case IPC_SENDRECV:
ret = ipc_sendrecv_extended(to, from, flags);
else
break;
case IPC_INVALID:
default:
printk("Unsupported ipc operation.\n");
ret = -ENOSYS;
}
} else {
switch (ipc_type) {
case IPC_SEND:
ret = ipc_send(to, flags);
break;
case IPC_RECV:
ret = ipc_recv(from, flags);
break;
case IPC_SENDRECV:
ret = ipc_sendrecv(to, from, flags);
break;
case IPC_INVALID:
default:
printk("Unsupported ipc operation.\n");
ret = -ENOSYS;
break;
case IPC_INVALID:
default:
printk("Unsupported ipc operation.\n");
ret = -ENOSYS;
}
}
return ret;
}

49
src/arch/arm/exception.c
View File

@@ -25,6 +25,39 @@
#define dbg_abort(...)
#endif
struct ipc_state {
u32 mr[MR_TOTAL];
unsigned int flags;
};
void ipc_save_state(struct ipc_state *state)
{
unsigned int *mr0_current = KTCB_REF_MR0(current);
BUG_ON(!mr0_current);
/* Save primary message registers */
for (int i = 0; i < MR_TOTAL; i++)
state->mr[i] = mr0_current[i];
/* Save ipc flags */
state->flags = tcb_get_ipc_flags(current);
}
void ipc_restore_state(struct ipc_state *state)
{
unsigned int *mr0_current = KTCB_REF_MR0(current);
BUG_ON(!mr0_current);
/* Restore primary message registers */
for (int i = 0; i < MR_TOTAL; i++)
mr0_current[i] = state->mr[i];
/* Restore ipc flags */
tcb_set_ipc_flags(current, state->flags);
}
/* Send data fault ipc to the faulty task's pager */
void fault_ipc_to_pager(u32 faulty_pc, u32 fsr, u32 far)
{
@@ -32,7 +65,6 @@ void fault_ipc_to_pager(u32 faulty_pc, u32 fsr, u32 far)
u32 mr[MR_TOTAL] = { [MR_TAG] = L4_IPC_TAG_PFAULT,
[MR_SENDER] = current->tid };
fault_kdata_t *fault = (fault_kdata_t *)&mr[MR_UNUSED_START];
unsigned int saved_flags;
/* Fill in fault information to pass over during ipc */
fault->faulty_pc = faulty_pc;
@@ -58,16 +90,12 @@ void fault_ipc_to_pager(u32 faulty_pc, u32 fsr, u32 far)
((unsigned long)&mr[0] -
offsetof(syscall_context_t, r3));
/* Save current ipc flags and set current flags to short ipc */
saved_flags = tcb_get_ipc_flags(current);
/* Set current flags to short ipc */
tcb_set_ipc_flags(current, IPC_FLAGS_SHORT);
/* Send ipc to the task's pager */
ipc_sendrecv(current->pagerid, current->pagerid, 0);
/* Restore ipc flags */
tcb_set_ipc_flags(current, saved_flags);
/*
* FIXME: CHECK TASK KILL REPLY !!!
* Here, pager has handled the request and sent us back a message.
@@ -87,15 +115,22 @@ int pager_pagein_request(unsigned long addr, unsigned long size, unsigned int fl
{
u32 abort;
unsigned long npages = __pfn(align_up(size, PAGE_SIZE));
struct ipc_state ipc_state;
set_abort_type(abort, ARM_DABT);
printk("%s: Kernel initiating paging-in requests\n", __FUNCTION__);
// printk("%s: Kernel initiating paging-in requests\n", __FUNCTION__);
/* Save current ipc state */
ipc_save_state(&ipc_state);
/* For every page to be used by the kernel send a page-in request */
for (int i = 0; i < npages; i++)
fault_ipc_to_pager(0, abort, addr + (i * PAGE_SIZE));
/* Restore ipc state */
ipc_restore_state(&ipc_state);
return 0;
}