6e0f3b3bda
sys_umap now supports only: - looking up the physical address of a virtual address in the address space of the caller; - looking up the physical address of a grant for which the caller is the grantee. This is enough for nearly all umap users. The new sys_umap_remote supports lookups in arbitrary address spaces and grants for arbitrary grantees.
36 lines
1.2 KiB
C
Executable file
36 lines
1.2 KiB
C
Executable file
#include "syslib.h"
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/*===========================================================================*
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* sys_umap_remote *
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*===========================================================================*/
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PUBLIC int sys_umap_remote(proc_ep, grantee, seg, vir_addr, bytes, phys_addr)
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endpoint_t proc_ep; /* process number to do umap for */
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endpoint_t grantee; /* process nr to check as grantee */
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int seg; /* T, D, or S segment */
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vir_bytes vir_addr; /* address in bytes with segment*/
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vir_bytes bytes; /* number of bytes to be copied */
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phys_bytes *phys_addr; /* placeholder for result */
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{
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message m;
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int result;
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/* Note about the grantee parameter:
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* - Is ignored for non-grant umap calls, but should be SELF to
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* pass the sanity check in that case;
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* - May be SELF to get the same behaviour as sys_umap, namely that the
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* caller must be the grantee;
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* - In all other cases, should be a valid endpoint (neither ANY nor NONE).
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*/
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m.CP_SRC_ENDPT = proc_ep;
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m.CP_DST_ENDPT = grantee;
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m.CP_SRC_SPACE = seg;
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m.CP_SRC_ADDR = vir_addr;
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m.CP_NR_BYTES = bytes;
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result = _kernel_call(SYS_UMAP_REMOTE, &m);
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*phys_addr = m.CP_DST_ADDR;
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return(result);
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}
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