83 lines
2.5 KiB
C
83 lines
2.5 KiB
C
// ke_irql.c - software IRQL skeleton
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#include <ke_irql.h>
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#include <ke_debug.h>
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#include <ke_apc.h>
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// Single-CPU bring-up state. When SMP arrives this becomes per-CPU state.
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static volatile KIRQL gCurrentIrql = PASSIVE_LEVEL;
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__declspec(dllexport) const char* KeIrqlName(KIRQL irql) {
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switch (irql) {
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case PASSIVE_LEVEL: return "PASSIVE_LEVEL";
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case APC_LEVEL: return "APC_LEVEL";
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case DISPATCH_LEVEL: return "DISPATCH_LEVEL";
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case HIGH_LEVEL: return "HIGH_LEVEL";
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default:
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if (irql >= DIRQL_BASE && irql < HIGH_LEVEL)
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return "DIRQL";
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return "INVALID_IRQL";
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}
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}
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__declspec(dllexport) KIRQL KeGetCurrentIrql(void) {
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return gCurrentIrql;
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}
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__declspec(dllexport) KIRQL KeRaiseIrql(KIRQL newIrql) {
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KIRQL oldIrql = gCurrentIrql;
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if (newIrql > HIGH_LEVEL) {
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KePanic("KeRaiseIrql: invalid target IRQL %u\n", (unsigned)newIrql);
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}
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if (newIrql < oldIrql) {
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KePanic("KeRaiseIrql: attempted raise from %s(%u) down to %s(%u)\n",
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KeIrqlName(oldIrql), (unsigned)oldIrql,
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KeIrqlName(newIrql), (unsigned)newIrql);
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}
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gCurrentIrql = newIrql;
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return oldIrql;
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}
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__declspec(dllexport) void KeLowerIrql(KIRQL oldIrql) {
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KIRQL currentIrql = gCurrentIrql;
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if (oldIrql > HIGH_LEVEL) {
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KePanic("KeLowerIrql: invalid target IRQL %u\n", (unsigned)oldIrql);
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}
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if (oldIrql > currentIrql) {
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KePanic("KeLowerIrql: attempted lower from %s(%u) up to %s(%u)\n",
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KeIrqlName(currentIrql), (unsigned)currentIrql,
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KeIrqlName(oldIrql), (unsigned)oldIrql);
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}
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gCurrentIrql = oldIrql;
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if (oldIrql == PASSIVE_LEVEL && currentIrql != PASSIVE_LEVEL)
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KiDeliverKernelApcs();
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}
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__declspec(dllexport) void KeAssertIrql(KIRQL expected) {
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KIRQL currentIrql = KeGetCurrentIrql();
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if (currentIrql != expected) {
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KePanic("IRQL assertion failed: expected %s(%u), current %s(%u)\n",
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KeIrqlName(expected), (unsigned)expected,
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KeIrqlName(currentIrql), (unsigned)currentIrql);
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}
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}
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__declspec(dllexport) void KeAssertIrqlAtOrBelow(KIRQL maxIrql) {
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KIRQL currentIrql = KeGetCurrentIrql();
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if (currentIrql > maxIrql) {
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KePanic("IRQL assertion failed: expected <= %s(%u), current %s(%u)\n",
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KeIrqlName(maxIrql), (unsigned)maxIrql,
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KeIrqlName(currentIrql), (unsigned)currentIrql);
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}
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}
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__declspec(dllexport) int KeCanWait(void) {
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return KeGetCurrentIrql() == PASSIVE_LEVEL;
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}
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