8108c811ed
Using the bitfield generator to treat guards and badges as a union type can be convenient, but it requires reserving a bit in the data for the bitfield run time type information. This type information is not needed by the kernel as it knows implicitly whether the passed data is a badge or a guard based on the kind of cap being operated on. However, with the type information present we cannot pass a word sized piece of data to the kernel. The solution here is to go back to using a plain seL4_Word as the type for invocations that want a capdata and let the user either construct a badge as a plain word, or use the seL4_CNode_CapData bitfield for constructing a guard, although they have to manually extract the word representation out of it.
105 lines
2.4 KiB
C
105 lines
2.4 KiB
C
/*
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* Copyright 2017, Data61
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* Commonwealth Scientific and Industrial Research Organisation (CSIRO)
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* ABN 41 687 119 230.
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*
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* This software may be distributed and modified according to the terms of
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* the BSD 2-Clause license. Note that NO WARRANTY is provided.
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* See "LICENSE_BSD2.txt" for details.
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*
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* @TAG(DATA61_BSD)
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*/
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#ifndef __LIBSEL4_ARCH_FUNCTIONS_H
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#define __LIBSEL4_ARCH_FUNCTIONS_H
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#include <sel4/types.h>
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#include <sel4/sel4_arch/functions.h>
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LIBSEL4_INLINE_FUNC seL4_Word
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seL4_GetMR(int i)
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{
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seL4_Word mr;
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SEL4_GET_IPCBUF_SCALE(msg, i, mr);
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return mr;
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}
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LIBSEL4_INLINE_FUNC void
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seL4_SetMR(int i, seL4_Word mr)
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{
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SEL4_SET_IPCBUF_SCALE(msg, i, mr);
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}
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LIBSEL4_INLINE_FUNC seL4_Word
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seL4_GetUserData(void)
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{
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seL4_Word data;
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SEL4_GET_IPCBUF(userData, data);
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return data;
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}
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LIBSEL4_INLINE_FUNC void
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seL4_SetUserData(seL4_Word data)
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{
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SEL4_SET_IPCBUF(userData, data);
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}
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LIBSEL4_INLINE_FUNC seL4_Word
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seL4_GetBadge(int i)
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{
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seL4_Word badge;
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SEL4_GET_IPCBUF_SCALE(caps_or_badges, i, badge);
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return badge;
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}
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LIBSEL4_INLINE_FUNC seL4_CPtr
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seL4_GetCap(int i)
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{
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seL4_CPtr cap;
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SEL4_GET_IPCBUF_SCALE(caps_or_badges, i, cap);
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return cap;
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}
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LIBSEL4_INLINE_FUNC void
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seL4_SetCap(int i, seL4_CPtr cptr)
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{
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SEL4_SET_IPCBUF_SCALE(caps_or_badges, i, cptr);
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}
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LIBSEL4_INLINE_FUNC void
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seL4_GetCapReceivePath(seL4_CPtr* receiveCNode, seL4_CPtr* receiveIndex, seL4_Word* receiveDepth)
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{
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if (receiveCNode != seL4_Null) {
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SEL4_GET_IPCBUF(receiveCNode, *receiveCNode);
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}
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if (receiveIndex != seL4_Null) {
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SEL4_GET_IPCBUF(receiveIndex, *receiveIndex);
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}
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if (receiveDepth != seL4_Null) {
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SEL4_GET_IPCBUF(receiveDepth, *receiveDepth);
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}
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}
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LIBSEL4_INLINE_FUNC void
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seL4_SetCapReceivePath(seL4_CPtr receiveCNode, seL4_CPtr receiveIndex, seL4_Word receiveDepth)
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{
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SEL4_SET_IPCBUF(receiveCNode, receiveCNode);
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SEL4_SET_IPCBUF(receiveIndex, receiveIndex);
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SEL4_SET_IPCBUF(receiveDepth, receiveDepth);
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}
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LIBSEL4_INLINE_FUNC seL4_IPCBuffer*
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seL4_GetIPCBuffer(void)
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{
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/* Assume that the address of our IPC buffer is in the user data word. Our
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* parent (or seL4_InitBootInfo in the case of the root task) should have
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* ensured this is true. The user is free to overwrite this data with
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* something else, but should then be aware they lose the functionality of
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* this function.
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*/
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return (seL4_IPCBuffer*)seL4_GetUserData();
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}
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#endif
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