6f77685609
mainly in the kernel and headers. This split based on work by Ingmar Alting <iaalting@cs.vu.nl> done for his Minix PowerPC architecture port. . kernel does not program the interrupt controller directly, do any other architecture-dependent operations, or contain assembly any more, but uses architecture-dependent functions in arch/$(ARCH)/. . architecture-dependent constants and types defined in arch/$(ARCH)/include. . <ibm/portio.h> moved to <minix/portio.h>, as they have become, for now, architecture-independent functions. . int86, sdevio, readbios, and iopenable are now i386-specific kernel calls and live in arch/i386/do_* now. . i386 arch now supports even less 86 code; e.g. mpx86.s and klib86.s have gone, and 'machine.protected' is gone (and always taken to be 1 in i386). If 86 support is to return, it should be a new architecture. . prototypes for the architecture-dependent functions defined in kernel/arch/$(ARCH)/*.c but used in kernel/ are in kernel/proto.h . /etc/make.conf included in makefiles and shell scripts that need to know the building architecture; it defines ARCH=<arch>, currently only i386. . some basic per-architecture build support outside of the kernel (lib) . in clock.c, only dequeue a process if it was ready . fixes for new include files files deleted: . mpx/klib.s - only for choosing between mpx/klib86 and -386 . klib86.s - only for 86 i386-specific files files moved (or arch-dependent stuff moved) to arch/i386/: . mpx386.s (entry point) . klib386.s . sconst.h . exception.c . protect.c . protect.h . i8269.c
59 lines
1.8 KiB
C
59 lines
1.8 KiB
C
/* The kernel call implemented in this file:
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* m_type: SYS_SEGCTL
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*
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* The parameters for this kernel call are:
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* m4_l3: SEG_PHYS (physical base address)
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* m4_l4: SEG_SIZE (size of segment)
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* m4_l1: SEG_SELECT (return segment selector here)
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* m4_l2: SEG_OFFSET (return offset within segment here)
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* m4_l5: SEG_INDEX (return index into remote memory map here)
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*/
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#include "../system.h"
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#if USE_SEGCTL
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/*===========================================================================*
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* do_segctl *
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*===========================================================================*/
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PUBLIC int do_segctl(m_ptr)
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register message *m_ptr; /* pointer to request message */
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{
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/* Return a segment selector and offset that can be used to reach a physical
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* address, for use by a driver doing memory I/O in the A0000 - DFFFF range.
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*/
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u32_t selector;
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vir_bytes offset;
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int i, index;
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register struct proc *rp;
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phys_bytes phys = (phys_bytes) m_ptr->SEG_PHYS;
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vir_bytes size = (vir_bytes) m_ptr->SEG_SIZE;
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int result;
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/* First check if there is a slot available for this segment. */
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rp = proc_addr(who_p);
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index = -1;
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for (i=0; i < NR_REMOTE_SEGS; i++) {
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if (! rp->p_priv->s_farmem[i].in_use) {
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index = i;
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rp->p_priv->s_farmem[i].in_use = TRUE;
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rp->p_priv->s_farmem[i].mem_phys = phys;
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rp->p_priv->s_farmem[i].mem_len = size;
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break;
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}
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}
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if (index < 0) return(ENOSPC);
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offset = alloc_remote_segment(&selector, &rp->p_seg,
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i, phys, size, USER_PRIVILEGE);
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result = OK;
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/* Request successfully done. Now return the result. */
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m_ptr->SEG_INDEX = index | REMOTE_SEG;
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m_ptr->SEG_SELECT = selector;
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m_ptr->SEG_OFFSET = offset;
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return(result);
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}
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#endif /* USE_SEGCTL */
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