MdePkg/BaseLib: BaseLib for RISCV64 architecture

[mirror_edk2.git] / MdePkg / Library / BaseLib / RiscV64 / InternalSwitchStack.c

diff --git a/MdePkg/Library/BaseLib/RiscV64/InternalSwitchStack.c b/MdePkg/Library/BaseLib/RiscV64/InternalSwitchStack.c
new file mode 100644 (file)
index 0000000..0bb2921
--- /dev/null
+++ b/MdePkg/Library/BaseLib/RiscV64/InternalSwitchStack.c
@@ -0,0 +1,55 @@
+/** @file\r
+  Switch stack function for RISC-V\r
+\r
+  Copyright (c) 2020, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>\r
+\r
+  SPDX-License-Identifier: BSD-2-Clause-Patent\r
+**/\r
+\r
+#include "BaseLibInternals.h"\r
+\r
+/**\r
+  Transfers control to a function starting with a new stack.\r
+\r
+  Transfers control to the function specified by EntryPoint using the\r
+  new stack specified by NewStack and passing in the parameters specified\r
+  by Context1 and Context2.  Context1 and Context2 are optional and may\r
+  be NULL.  The function EntryPoint must never return.\r
+  Marker will be ignored on IA-32, x64, and EBC.\r
+  IPF CPUs expect one additional parameter of type VOID * that specifies\r
+  the new backing store pointer.\r
+\r
+  If EntryPoint is NULL, then ASSERT().\r
+  If NewStack is NULL, then ASSERT().\r
+\r
+  @param  EntryPoint  A pointer to function to call with the new stack.\r
+  @param  Context1    A pointer to the context to pass into the EntryPoint\r
+                      function.\r
+  @param  Context2    A pointer to the context to pass into the EntryPoint\r
+                      function.\r
+  @param  NewStack    A pointer to the new stack to use for the EntryPoint\r
+                      function.\r
+  @param  Marker      VA_LIST marker for the variable argument list.\r
+\r
+**/\r
+VOID\r
+EFIAPI\r
+InternalSwitchStack (\r
+  IN      SWITCH_STACK_ENTRY_POINT  EntryPoint,\r
+  IN      VOID                      *Context1,   OPTIONAL\r
+  IN      VOID                      *Context2,   OPTIONAL\r
+  IN      VOID                      *NewStack,\r
+  IN      VA_LIST                   Marker\r
+  )\r
+{\r
+  BASE_LIBRARY_JUMP_BUFFER  JumpBuffer;\r
+\r
+  DEBUG ((DEBUG_INFO, "RISC-V InternalSwitchStack Entry:%x Context1:%x Context2:%x NewStack%x\n", \\r
+          EntryPoint, Context1, Context2, NewStack));\r
+  JumpBuffer.RA = (UINTN)EntryPoint;\r
+  JumpBuffer.SP = (UINTN)NewStack - sizeof (VOID *);\r
+  JumpBuffer.S0 = (UINT64)(UINTN)Context1;\r
+  JumpBuffer.S1 = (UINT64)(UINTN)Context2;\r
+  LongJump (&JumpBuffer, (UINTN)-1);\r
+  ASSERT(FALSE);\r
+}\r