add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/mips/kernel/watch.c
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@@ -27,12 +27,15 @@
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 	case 4:
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 		write_c0_watchlo3(watches->watchlo[3]);
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 		write_c0_watchhi3(watchhi | watches->watchhi[3]);
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+		fallthrough;
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 	case 3:
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 		write_c0_watchlo2(watches->watchlo[2]);
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 		write_c0_watchhi2(watchhi | watches->watchhi[2]);
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+		fallthrough;
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 	case 2:
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 		write_c0_watchlo1(watches->watchlo[1]);
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 		write_c0_watchhi1(watchhi | watches->watchhi[1]);
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+		fallthrough;
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 	case 1:
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 		write_c0_watchlo0(watches->watchlo[0]);
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 		write_c0_watchhi0(watchhi | watches->watchhi[0]);
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@@ -55,10 +58,13 @@
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 		BUG();
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 	case 4:
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 		watches->watchhi[3] = (read_c0_watchhi3() & watchhi_mask);
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+		fallthrough;
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 	case 3:
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 		watches->watchhi[2] = (read_c0_watchhi2() & watchhi_mask);
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+		fallthrough;
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 	case 2:
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 		watches->watchhi[1] = (read_c0_watchhi1() & watchhi_mask);
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+		fallthrough;
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 	case 1:
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 		watches->watchhi[0] = (read_c0_watchhi0() & watchhi_mask);
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 	}
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@@ -85,18 +91,25 @@
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 		BUG();
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 	case 8:
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 		write_c0_watchlo7(0);
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+		fallthrough;
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 	case 7:
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 		write_c0_watchlo6(0);
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+		fallthrough;
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 	case 6:
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 		write_c0_watchlo5(0);
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+		fallthrough;
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 	case 5:
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 		write_c0_watchlo4(0);
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+		fallthrough;
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 	case 4:
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 		write_c0_watchlo3(0);
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+		fallthrough;
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 	case 3:
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 		write_c0_watchlo2(0);
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+		fallthrough;
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 	case 2:
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 		write_c0_watchlo1(0);
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+		fallthrough;
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 	case 1:
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 		write_c0_watchlo0(0);
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 	}