37 lines
1 KiB
C
37 lines
1 KiB
C
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/* The system call implemented in this file:
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* m_type: SYS_KMALLOC
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*
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* The parameters for this system call are:
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* m4_l2: MEM_CHUNK_SIZE (request a buffer of this size)
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* m4_l1: MEM_CHUNK_BASE (return physical address on success)
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*
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* Author:
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* Jorrit N. Herder <jnherder@cs.vu.nl>
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*/
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#include "../kernel.h"
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#include "../system.h"
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/*===========================================================================*
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* do_kmalloc *
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*===========================================================================*/
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PUBLIC int do_kmalloc(m_ptr)
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register message *m_ptr; /* pointer to request message */
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{
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/* Request a (DMA) buffer to be allocated in one of the memory chunks. */
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phys_clicks tot_clicks;
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struct memory *memp;
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tot_clicks = (m_ptr->MEM_CHUNK_SIZE + CLICK_SIZE-1) >> CLICK_SHIFT;
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memp = &mem[NR_MEMS];
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while ((--memp)->size < tot_clicks) {
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if (memp == mem) {
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return(ENOMEM);
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}
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}
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memp->size -= tot_clicks;
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m_ptr->MEM_CHUNK_BASE = (memp->base + memp->size) << CLICK_SHIFT;
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return(OK);
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}
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