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1 | /** @file |
2 | Implementation of Multiple Processor PPI services. | |
3 | ||
4 | Copyright (c) 2015, Intel Corporation. All rights reserved.<BR> | |
5 | This program and the accompanying materials | |
6 | are licensed and made available under the terms and conditions of the BSD License | |
7 | which accompanies this distribution. The full text of the license may be found at | |
8 | http://opensource.org/licenses/bsd-license.php | |
9 | ||
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. | |
12 | ||
13 | **/ | |
14 | ||
15 | #include "PeiMpServices.h" | |
16 | ||
17 | ||
18 | ||
19 | /** | |
20 | Find the current Processor number by APIC ID. | |
21 | ||
22 | @param PeiCpuMpData Pointer to PEI CPU MP Data | |
23 | @param ProcessorNumber Return the pocessor number found | |
24 | ||
25 | @retval EFI_SUCCESS ProcessorNumber is found and returned. | |
26 | @retval EFI_NOT_FOUND ProcessorNumber is not found. | |
27 | **/ | |
28 | EFI_STATUS | |
29 | GetProcessorNumber ( | |
30 | IN PEI_CPU_MP_DATA *PeiCpuMpData, | |
31 | OUT UINTN *ProcessorNumber | |
32 | ) | |
33 | { | |
34 | UINTN TotalProcessorNumber; | |
35 | UINTN Index; | |
36 | ||
37 | TotalProcessorNumber = PeiCpuMpData->CpuCount; | |
38 | for (Index = 0; Index < TotalProcessorNumber; Index ++) { | |
39 | if (PeiCpuMpData->CpuData[Index].ApicId == GetInitialApicId ()) { | |
40 | *ProcessorNumber = Index; | |
41 | return EFI_SUCCESS; | |
42 | } | |
43 | } | |
44 | return EFI_NOT_FOUND; | |
45 | } | |
46 | ||
47 | ||
48 | /** | |
49 | This return the handle number for the calling processor. This service may be | |
50 | called from the BSP and APs. | |
51 | ||
52 | This service returns the processor handle number for the calling processor. | |
53 | The returned value is in the range from 0 to the total number of logical | |
54 | processors minus 1. The total number of logical processors can be retrieved | |
55 | with EFI_PEI_MP_SERVICES_PPI.GetNumberOfProcessors(). This service may be | |
56 | called from the BSP and APs. If ProcessorNumber is NULL, then EFI_INVALID_PARAMETER | |
57 | is returned. Otherwise, the current processors handle number is returned in | |
58 | ProcessorNumber, and EFI_SUCCESS is returned. | |
59 | ||
60 | @param[in] PeiServices An indirect pointer to the PEI Services Table | |
61 | published by the PEI Foundation. | |
62 | @param[in] This A pointer to the EFI_PEI_MP_SERVICES_PPI instance. | |
63 | @param[out] ProcessorNumber The handle number of the AP. The range is from 0 to the | |
64 | total number of logical processors minus 1. The total | |
65 | number of logical processors can be retrieved by | |
66 | EFI_PEI_MP_SERVICES_PPI.GetNumberOfProcessors(). | |
67 | ||
68 | @retval EFI_SUCCESS The current processor handle number was returned in | |
69 | ProcessorNumber. | |
70 | @retval EFI_INVALID_PARAMETER ProcessorNumber is NULL. | |
71 | **/ | |
72 | EFI_STATUS | |
73 | EFIAPI | |
74 | PeiWhoAmI ( | |
75 | IN CONST EFI_PEI_SERVICES **PeiServices, | |
76 | IN EFI_PEI_MP_SERVICES_PPI *This, | |
77 | OUT UINTN *ProcessorNumber | |
78 | ) | |
79 | { | |
80 | PEI_CPU_MP_DATA *PeiCpuMpData; | |
81 | ||
82 | PeiCpuMpData = GetMpHobData (); | |
83 | if (PeiCpuMpData == NULL) { | |
84 | return EFI_NOT_FOUND; | |
85 | } | |
86 | ||
87 | if (ProcessorNumber == NULL) { | |
88 | return EFI_INVALID_PARAMETER; | |
89 | } | |
90 | ||
91 | return GetProcessorNumber (PeiCpuMpData, ProcessorNumber); | |
92 | } | |
93 |